Can you solve this 2nd grade problem that has baffled adults?

Рет қаралды 111,576

Ай бұрын

A question assigned to 7 year old students completely stumped a mother who posted it online asking for help.
Reddit AskMath
/ 2nd_grade_math_questio...
Wikipedia Addition
en.wikipedia.org/wiki/Addition
Kidspot
www.kidspot.com.au/parenting/...
Scoop Upworthy
scoop.upworthy.com/second-gra...
Tyla
www.tyla.com/life/parenting/m...
Subscribe: kzfaq.info...
Send me suggestions by email (address at end of many videos). I may not reply but I do consider all ideas!
If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.
If you purchase through these links, I may be compensated for purchases made on Amazon. As an Amazon Associate I earn from qualifying purchases. This does not affect the price you pay.
Book ratings are from January 2023.
My Books (worldwide links)
mindyourdecisions.com/blog/my...
My Books (US links)
Mind Your Decisions: Five Book Compilation
amzn.to/2pbJ4wR
A collection of 5 books:
"The Joy of Game Theory" rated 4.3/5 stars on 290 reviews
amzn.to/1uQvA20
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4.1/5 stars on 33 reviews
amzn.to/1o3FaAg
"40 Paradoxes in Logic, Probability, and Game Theory" rated 4.2/5 stars on 54 reviews
amzn.to/1LOCI4U
"The Best Mental Math Tricks" rated 4.3/5 stars on 116 reviews
amzn.to/18maAdo
"Multiply Numbers By Drawing Lines" rated 4.4/5 stars on 37 reviews
amzn.to/XRm7M4
Mind Your Puzzles: Collection Of Volumes 1 To 3
amzn.to/2mMdrJr
A collection of 3 books:
"Math Puzzles Volume 1" rated 4.4/5 stars on 112 reviews
amzn.to/1GhUUSH
"Math Puzzles Volume 2" rated 4.2/5 stars on 33 reviews
amzn.to/1NKbyCs
"Math Puzzles Volume 3" rated 4.2/5 stars on 29 reviews
amzn.to/1NKbGlp
2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter.
My Blog
mindyourdecisions.com/blog/
Twitter
/ preshtalwalkar
Instagram
/ preshtalwalkar
Merch
teespring.com/stores/mind-you...
Patreon
/ mindyourdecisions
Press
mindyourdecisions.com/blog/press

Пікірлер: 929

@xenathcytrin202 Ай бұрын

looking at it, I genuinely have no idea what the problem even is.

@bebektoxic2136 Ай бұрын

English is also not my mother tongue and I understand why you don't understand.

@Jreaddy Ай бұрын

They throw in word words the kids should know, 99% of the time I get stuck on soemthing helping my kid, I ask, “how did you learn this” and they’ll show me a quick easy thing and it’ll click in my head, there’s always a random word for me that I have no idea what they mean lol. Like in this it was “addend” or whatever that word was, remove that word and I’m good hahahah

@Moses_VII Ай бұрын

They never taught me the word 'addend' in school. They just say 'one of the two numbers which get added'.

@user-pm7fv9dt6j Ай бұрын

@@Moses_VIIsame

@JLvatron Ай бұрын

@@bebektoxic2136 Even with English tonguers, nobody knows what an Addend is.

@philosopherkingzant2037 Ай бұрын

I need to go back to 2nd grade English because I had no idea what the question even asked

@Moses_VII Ай бұрын

Addend is a word none of us were taught

@scaper8 Ай бұрын

@@Moses_VIIYeah, I'm pretty good at math, and I truly do not think I was ever taught the words "addend," "aguend," nor "summand." I know "term" and "sum," but not the others.

@josephcarland Ай бұрын

The wording of the question is confusing.

@hermand Ай бұрын

Haha, right. "Have a go at solving it?" I don't even know what the question is!

@worldsfunniestvideosandbes3684 Ай бұрын

That's what my problem with the question was also. 😂 @@Moses_VII

@Unknown-gc7tn Ай бұрын

The whole reason this is difficult is because you can overcomplicate the question

@worstusernameintheworld9871 Ай бұрын

exactly, the equation can be written as my first answer (which is 6 + 20 + 800 = 826 aka I only used the digits listed in the question). The thing is, you can TECHNICALLY add more digits to your equation since the question never stated that you should ONLY use the digits listed in the question (for example: 6 + 20 + 800 + 826 = 1452, aka my second answer, nobody said I couldn't add a "1452" to my equation). This makes the question more complicated than what it's probably initially intended for (aka ONLY using the numbers listed to make an addition equation). edit: I saw another viable solution that makes sense which also bends the supposed "rules" of the question, as nowhere in the question states that you ONLY need a 1-, 2-, and 3-digit addend, resulting in this addition equation: 8 + 68 + 206 + 0 + 0 = 828 The thing that stumps most people the most, however, is the fact that they have no idea what an addend is, and since English is a second language to most people in my country, I get it (lucky for me, I grew up speaking English AND we were taught about "addends", "subtractor/subtrahend", "factor", "dividend/divisor", etc. where I live so it's just an advantage for people like me).

@LtPowers 11 күн бұрын

And it's easy to overcomplicate because they used digits that add up to each other. Makes you think the two has to add to the six to make eight, or 2+8 to make a 0.

@johng.1703 3 күн бұрын

what's overly complicated about the question?

@johng.1703 3 күн бұрын

@@LtPowers I'm pretty sure that makes it much easier. anyone with half a brain would know that when you add 8+2 you don't just get zero, you also add 1 to the next column, which automatically means you can't have 8+2 in a column as there are no odd numbers.

@smylesg Ай бұрын

The question should have stated, "using only this complete set of digits." Nothing in the problem statement prevents you from adding more digits.

@softreyna Ай бұрын

I wonder if this is the intention? It makes the math of the problem MUCH easier, and that kind of logic, while not something most of us were taught in second grade, is something that I think a second grader could grasp, especially if they're already being taught what an equation is. I mean, I mostly remember second grade math focusing on doing basic addition quickly, and they probably don't have to spend nearly as much time on that in the "you DO keep a calculator in your pocket at all times" era.

@nieshmiesh Ай бұрын

just what I thought, also with the amount of addends so 6+22+680+800=1508 is a solution.

@otakurocklee Ай бұрын

exactly.

@DumbMuscle Ай бұрын

This is only possible if you also have an additional addend (which is also not specified, so the question is still underspecified). If you have 1 more digit, it has to go somewhere - and if your addends are defined, you'll need a 4 digit sum (so you can fit all the given digits and your new one). A+BB+CCC=DDDD requires the 4 digit sum to start with a 1, since a 1 digit number + a 2 digit number + a 3 digit number is at most 9+99+999=1107. Since 1 is not part of the given digits, it must be the new digit you added (assuming no leading 0s). So to get this you need to use 6 of the given digits to add together to a 4 digit number. However, the largest of the given digits is an 8, and 8+88+888 < 1000, so you cannot create a 4 digit sum using the given digits, so the total number of digits matches the number of given digits.

@leoperd3487 Ай бұрын

That was my first thought

@redchan2571 Ай бұрын

Honestly this feels more like a language comprehension question than a math question If i were to construct the question i would write: Use the following numbers to construct a valid equation by filling in the boxes below 2,2,6,6,8,8,0,0,0 [] [] [] + [] [] + [] = [] [] []

@hillaryclinton1314 29 күн бұрын

I will go with this... The original question was horribly constructed!

@scottmcshannon6821 29 күн бұрын

@@hillaryclinton1314 the original question used terms no 2nd grader ever heard.

@jnharton 27 күн бұрын

@@scottmcshannon6821 Says who? I'm sure that digit, equation, addition, and addend were all mentioned in math classes before.

@softy8088 25 күн бұрын

@@jnharton Strangely I had never heard "addend" and had to look it up as an adult when I was writing some documentation.

@grillbesteck6319 24 күн бұрын

Ohhh then it’s easy, it’s 800 + 60 + 2 = 862

@BangkokBubonaglia Ай бұрын

The 3 zeroes are the key. Once you realize there are only 2 of everything else, you understand that everything that appears in the addends also has to appear in the sum, and there are enough zeroes to make that happen. There are no odd numbers available to do any kind of carry logic. It's actually probably easier for a second grader, who doesn't have a lot of experience carrying digits forward yet, so they see the obvious solution right away.

@mullergyula4174 Ай бұрын

Exactly. If you avoid the carrying then it is simple.

@michaeljayne6731 Ай бұрын

Simple, but I wonder what practical use it has. Just realizing that adding a 0 with a digit (an integer in the range [0,9]) yields the digit being added?

@barahoupt7849 13 күн бұрын

Exactly! What a neat question!

@rdbchase Күн бұрын

No, you have misinterpreted the problem.

@rdbchase Күн бұрын

@@barahoupt7849 Exactly wrong -- you all rejected the problem and solved a different one without even realizing it.

@snowfloofcathug Ай бұрын

I really like the compliment to her for trying for an hour before asking for help. And I fully agree! Giving it a proper try *and* asking for help once you’re sure you need it are both amazing habits

@Fred-yq3fs Ай бұрын

Primary school homework should never take more than 30 min. and it should be practice and nothing else. Go have 3 kids and put 3h in every week day. ffs.

@snowfloofcathug Ай бұрын

@@Fred-yq3fs 1. I agree that her spending half an hour on the question would’ve already been enough 2. One problem taking an hour once isn’t even bad as long as they’re typically much shorter 3. I can commend her habits without thinking it should take that long

@smellydeadcat2178 Ай бұрын

@@Fred-yq3fsI'm stumped...ffs?

@66niloc97 23 күн бұрын

I am 58 UK born and I have never heard of or seen or even been told of the word addend before

@kingoffongpei Ай бұрын

I get why people might be confused, but probably just because the wording and phrasing is rough for people who have been out of school for a long time and don't do math regularly. It took me a minute to see what the teacher's intent was but I think it's pretty fair for second graders who were just learning it in class that week.

@hrayz Ай бұрын

A student in that class would be introduced to the Wording before these questions. Once they know these words, the question can "make sense" for them. The poor parents, who learned the "old" language, won't know what is being asked.

@Fred-yq3fs Ай бұрын

@@hrayz That's a problem in and by itself. There is no "new wording" to be had, especially not in primary school. It's basic knowledge. it's thousands of years old. No need to make it new every 2 years... except for the bottom line of text book editors of course.

@SC-gs8dc Ай бұрын

@Fred-yq3fs This is the old language. I was taught this in grade 2 about 40 years ago.

@yippee8570 Ай бұрын

@@SC-gs8dc Not in the UK. Never heard of 'addend' before. It's not used when teaching numeracy here.

@57thorns Ай бұрын

@@yippee8570 English is my second language, but I since i know the word addition I could make it out with no problem.

@avpmobi Ай бұрын

I am 68 and just learnt what addend is. I have never heard that word before. I have o and a level maths. But the problem is not the maths it is the English. How about arrange the above digits to form a 1 digit, a 2 digit and 3 digit number which when added together make a number formed of the remaining digits.. Simple!!

@kmbbmj5857 Ай бұрын

I agree that's much better wording. In fact I believe much of the problem so many people have with math and word problems is not the math, but the way the problems are written.

@beng4186 Ай бұрын

@@kmbbmj5857 A poor tradesman blames his tools. It's the not the fault of the question writer that you don't understand fundamental mathematics terminology - that obviously would have been taught in this class.

@cmilkau Ай бұрын

Understanding these kinds of wordings is part of the training.

@avpmobi Ай бұрын

@@beng4186It maybe now it wasn't then or probably when the mother was at school. Not sure it is a term used in the UK now.

@Fred-yq3fs Ай бұрын

Plain English. No technical pedantic language in primary school. Too obvious I guess.

@mattdbower Ай бұрын

The problem didn’t state that you should only use the given digits, just that they must all be used, so adding extra terms would open up a huge number of additional solutions.

@WillRennar Ай бұрын

Took me longer to figure out what the problem wanted me to do than to solve it. It's asking for us to use those 9 digits to make a valid addition problem: 3 digits to make one of the addends, 2 to make another, 1 to make a 3rd, and then the last 3 to make the total. Took me 5 minutes to work that out and 1 minute to come up with 600 + 20 + 8 = 628.

@michaelz6555 Ай бұрын

Solved it in 30 seconds in my head, but I harbor no illusions that it would be within reach of most second graders.

@sanamite Ай бұрын

You mean finding out there were 48 solutions?

@trumpetbob15 Ай бұрын

Yeah, I got a correct answer quickly but most of my problem was seeing if I even understood the problem correctly.

@michaelz6555 Ай бұрын

@@sanamite the sufficiency case was one solution, as it would have been for the second graders. I intuited several solutions by digital permutation but didn’t go to the trouble to count them.

@Rickety3263 Ай бұрын

That’s always the hype title for these kinds of videos “third grade Chinese math problem stumps physics professors”

@nathanielgarza9198 Ай бұрын

All they needed to say is create a equation that adds a 1-digit number, a 2-digit number and a 3-digit number with these digits included

@barttemolder3405 Ай бұрын

2 + 60 + 800 = 862 ?

@TheGolux Ай бұрын

or any such variation yeah.

@Daniel-ef6gg Ай бұрын

Ya, I did 8+20+600=628

@charliethunkman Ай бұрын

There are 3 0s for a reason...

@wyattstevens8574 Ай бұрын

Good one- here's what I did: 0+0+[permutation of 2, 6, and 8]=[3-digit number] (I thought "stretch your thinking" meant "0 doesn't have to be a single digit.")

@jdmichal Ай бұрын

Yes. The kids are probably learning or reviewing place values. The context makes the intended answer more obvious.

@nodroGnotlrahC Ай бұрын

It is most probable that the question was set as homework in order to reinforce the lesson taught in class that day. Before you help your child with their homework it is a good idea to ask them what they were taught, and to show you the relevant pages in their work books. This will often guide you towards the sort of answers required.

@MarieAnne. 24 күн бұрын

That's a good point. I definitely remember being taught in elementary school how to break numbers down using their place values, such as: 135 = 100 + 30 + 5 So if that was the lesson taught, it would be obvious the answer would be in the form: a00 + b0 + c = abc, where a, b, c have values 2, 6, 8 in some order.

@xXJLNINJAXx 23 күн бұрын

The books suck ass.

@kevinslater4126 Ай бұрын

This is not a problem about math this is a problem about definitions. I can guarantee the kids were taught what to do

@angrytedtalks Ай бұрын

I am 60. Until today I have never seen the word "addend" used in a math question for 7 year olds. It is a very poorly formatted question.

@misterjaxon2559 3 күн бұрын

I did a math minor in college. Had to look up the word "addend."

@angelhelp Ай бұрын

Guessing was never a permitted part of math classes, not even when estimation was taught. We had to learn the teacher’s way of solving problems and be able to duplicate it in any problem we encountered.

@Anonymous8547 27 күн бұрын

Inspection is a very important to learn in math, particularly in Calc II and Differential equations.

@HienNguyenHMN Ай бұрын

Every time it's "student's math problem stumps parents" I guarantee it's something the teacher already explained in class but the student wasn't paying attention.

@mattm8870 29 күн бұрын

Or the parents haven't bother to ask the question what did the teacher teach you today.

@shadesoftime 23 күн бұрын

Neither did the parents, and they even lack the basic deductive skills to find that "addend" probably means one of the numbers being *add*ed. I'm a non-native English speaker on the verge of failing English literature, but it only took me about 30 seconds to figure this one out. And no, I haven't seen that word once in my life.

@Henry3.1415 Ай бұрын

It took me like a minute to understand what the question is asking but then I got the answer in just 10 seconds

@cypherknot Ай бұрын

The problem with some of these is the way they are worded. They can be ambiguous and confusing and neglect to clarify just what is wanted.

@Risu0chan Ай бұрын

You missed solutions with a different pattern: 60 + 208 = 260 + 8, 20 + 806 = 820 + 6, etc.

@corvididaecorax2991 Ай бұрын

Those aren't really addition equations. They are equations, but from what I can find addition equation means two or more numbers added together with the sum on the other side of the equals sign. If you have anything but just the sum over there it isn't an addition equation..

@HarvardHeinous Ай бұрын

@@corvididaecorax2991 Whoa, there's an official definition of "addition equation"? >_

@corvididaecorax2991 Ай бұрын

@@HarvardHeinous Honestly I just Googled it. Some websites listed that as a definition. I'm not sure how official it is, but I didn't find anything that gave any other definition. But it is Mathematics. Everything has definitions.

@thomasmaughan4798 Ай бұрын

I also considered the possibility of a compound sum on the right hand side. But, second grade, probably not.

@Warcraft_Traveler Ай бұрын

Not a solution, since the problem stated "a 1, a 2 and a 3 digits *addend* ".

@JohnDlugosz 28 күн бұрын

"What's wrong?" The meta-answer is to look at the child's curriculum. "Decomposing parts of numbers using the positional system" is the key.

@billy.7113 Ай бұрын

Flipping "6" to "9" is not enough. Why not rotating "8" 90° and turning it into ♾️ ? 😮😨

@olima- 9 күн бұрын

Or cutting the 8 into two small 0s or two 3s.

@mrmimeisfunny Ай бұрын

The real question is more "what does this question mean?" I thought the sum wasn't supposed to be part of the digits. So my answer was 006+062+822=890 which is a stretch to the definition of an "n digit number".

@asadyousafzai937 Ай бұрын

Same. I never even considered that the answer HAD to be from within the remaining digits and therefore couldn't solve it. Although that is a failure on my part since the question didn't state otherwise either

@ricardoescareno8135 Ай бұрын

The key is in the word "equation". With that word, the problem is telling you it's needed to write on both sides of the equal sign

@davidobermeyer26 Ай бұрын

No, a teacher would not accept a number with leading zeros to use up the otherwise unused zeros.

@shadesoftime 23 күн бұрын

You used 4 zeroes, 3 twos and a number not even in the question. Are you sure you got it?

@XTLmaker Ай бұрын

this question feels like its easy but has the most absurd wording ever, i have never once heard 'addend' in my entire life

@esteban-zamora 23 күн бұрын

I am suprised people found this difficult, but tthis being for grade 2s is insane. Maybe grade 4s or 5s

@TomNimitz Ай бұрын

I see 108 solutions, once an initial candidate is found: - 6 column assignment combinations for the 3 non-zero pairs, - 6 row arrangements for the 1, 2, and 3 digit numbers, and - 3 arrangements for the last column (assuming that 0 counts as a stand-alone 1-digit number). (I did not allow leading zeros beyond the lone zero.)

@MercuriusCh Ай бұрын

Literally 90s of thinking is enough to get 2 + 60 + 800 = 862 Or it can be any permutation of 2, 6 and 8

@leoperd3487 Ай бұрын

My immediate thought was, “It says I have to use _all_ the digits shown, but not _only_ the digits shown, meaning there is an infinite amount of answers, as I can just add more numbers infinitely.”

@TheJaguar1983 18 күн бұрын

I honestly found it ridiculously easy once I figured out where to put the zeros. Took me about 5 minutes in total. Hats off to anyone who can find any solutions with two non-zero numbers in the same column with no leading zeros.

@keithwood6459 16 күн бұрын

I messed with that avenue for a while, but realized there were roadblocks. Can't carry a one, because no odd numbers. Can only carry a two from the first column (6+6+8), but then run out of sixes and nothing else works. Presh's simulation of all possible combos shows the range of answers is all of similar types. Nothing exotic turned up.

@jademonass2954 24 күн бұрын

if they had drawn those boxes representing the equation below the question, i bet people would have gotten it easily it was just worded horribly i didnt understand that i needed to use the numbers in the list on the answer too

@ZeroGravityDog Ай бұрын

200+60+8, or 200+80+6, or 600+80+2, etc etc. A little bit of thought gets you there and a 7-year old might benefit from the exercise without Mom spreading math-panic

@wyattstevens8574 Ай бұрын

I think I figured it out- "stretch your thinking" is code: it means, "0 doesn't have to be just one digit!" With that in mind, there's 6 potential solutions: 0+00+[one of 268, 286, 628, 682, 826, or 862] = 3-digit added

@NihaarB Ай бұрын

those 6 solutions are already included in the answer of 36

@wyattstevens8574 Ай бұрын

@@NihaarB I hadn't even *watched* the video when this solution hit me!

@NihaarB Ай бұрын

@@wyattstevens8574 👍

@sparkyshore3543 29 күн бұрын

The way I see it, there are 216 separate solutions. You can’t include leading zeros but you can count 200+80+6=286, 80+6+200=286, and 286=200+80+6 as three separate valid responses. Just because the responses are equivalent doesn’t make them redundant.

@russell2952 Күн бұрын

This is what happens when art history majors teach math. They have no understanding of how rigorous math is and how ambiguity and vagueness are, for all intents and purposes, forbidden.

@dtrischuk Ай бұрын

Just a silly idea, but if we decide we can rotate digits... 2 + 26 + 600 + 0 + ∞ = ∞ And, of course, lots of variations.

@petervanvelzen1950 Ай бұрын

You have replaced the 8's by something that is not a digit

@davidlohmann5098 Ай бұрын

I think this is the most clever answer

@gorak9000 Ай бұрын

that has 5 addends, not 3

@chaosgyro Ай бұрын

@gorak9000 It requires 1, 2, and 3 digit addends, but doesn't specifically limit itself to those.

@chicken_rice0123 Ай бұрын

i will solve a math problem for every like this gets

@Oceans2Galaxies Ай бұрын

Go ahead do it

@Oceans2Galaxies Ай бұрын

Solve Eighteen math problems

@keithwood6459 16 күн бұрын

I solve a problem have math every one gets one. Thank you.

@TheMNB Ай бұрын

IM0, using 0 as an addend is acceptable, but 00 or a number with a leading zero is not as that's not how numbers are typically described. Yes, 00 is 0 and is valid, but I think most teachers would flag that. Also, the answer should not have a leading zero. eg: 8+60+200=268

@Coolpig551 Ай бұрын

I don’t really get why this was hard for people, you just do 0 + 00 + some combination of 628 and make that equal the same combination

@sock1533 Ай бұрын

For a 2nd grade student this is nuts

@aguyontheinternet8436 Ай бұрын

it honestly doesn't look too bad. There are so many solutions, just some guesswork and a little thinking should easily stumble you into an answer

@someguy999 Ай бұрын

I could see some students getting it if they had done similar questions in class and in their homework assignments. If this just came out of the blue, it would be way too hard imo.

@mattc3581 Ай бұрын

In context of their classwork it is probably very simple. I imagine they have been learning to split up a number into hundreds, tens and units, eg 862 = 800 + 60 + 2. Creating any three digit number from different digits given in the question would then allow it to be split into hundreds, tens and units as an answer to the question.

@paulgreen9059 Ай бұрын

As long as it was presented to the kids as a brain-teaser, I think it's a pretty fun little puzzle. Better than pages of addition problems which is what I got in 2nd grade.

@Skank_and_Gutterboy Ай бұрын

There's no way in hell this was assigned to 2nd graders unless it was extra-credit and nobody was really expected to get it. 2nd grade math is learning to add and subtract through tons and tons of repetition. This video poster does this all the time, he takes these problems that give the average high school math student a lot of problems and says that it was assigned to 8 year olds (usually he says "gifted" 8 year olds). He throws in a strong implication, "A bunch of kiddies got it, what's wrong with you?" Same sh!+, different day.

@paulgreen9059 Ай бұрын

@@Skank_and_Gutterboy It requires both a knowledge of addition, and a flexibility of mind. I don't think 2nd graders lack either of those things, but they need to learn to use both and that's the great thing about brain-teasers.

@johnm5928 13 күн бұрын

This feels like one of those questions the book author thought was so clever but in reality it was just a terrible idea that probably confused all but the smartest kids in the room.

@geekjokes8458 Ай бұрын

the trick of this question is context: i'd say that this exercise is in a chapter in the school textbook probably teaches about "tens, hundreds, thousands", and/or how to write and manipulate summations with "carry over", what to do with leading zeroes, etc this exercise is training the students'ability to comprehend and interpret the text, but is also to help the _teacher_ discern the individual students' abilities 1) the student that goes for the low effort answer: 0+00+268=268 (or permutations) 2) the student that struggles to find an answer, whether they do it or not - most of them will be in this category 3) the student that finds a couple of answers or possibly a _pattern_ in those answers and i guess a 4th category would be *you,* the obviously-not-a-second-grader

@FlatEarthMath Ай бұрын

30 year math teacher here. I'm so saddened as to what has happened to math instruction here in the US. Incomprehensible instructions are the rule, apparently. Mathematically incorrect procedures are also the norm. The big problem is that people teaching math typically had "math" as their worst subject when they were in school.

@The14Some1 Ай бұрын

On the other hand, somewhat incomprehensible insructions is a nice way to teach children how to deal with such cases in our anyways imperfect world, full of poor instructions and ambiguities

@cmilkau Ай бұрын

I'm not from the US. In my experience, the teachers were all excelling at math, but usually horrible at communication. But maths is not just logic it's also its own, very unusual language and you need to excel at both logic and translation to teach it. It's a lot more than just memorising what addend means. Unfortunately maths geeks are so routined in this language they don't even realize. I remember trying to explain something abstract to a random person saying "imagine it as a mathematical function mapping positions to colors" or similar, and I was stopped mid-sentence with "what is a function?!" That's not just a hole in vocabulary, explaining that concept is harder than explaining what it was supposed to illustrate.

@I.____.....__...__ Ай бұрын

@@The14Some1 No, "trick" questions are NOT appropriate for young children. They do NOT teach kids to "think outside the box", they just confuse kids and put them off wanting to learn. Trick-questions should be reserved for later, maybe college. Elementary-school is for teaching basics and setting a foundation. I hate it when I see teachers trying to TRICK young children. 😒

@verkuilb Ай бұрын

Why are you assuming that this problem is from the US? The internet is worldwide! And even if it is from the US--so what? Part of learning math, and learning in general, is learning how to adapt your learning to different presentations or instructions. Life doesn't present problems to people in the form of cookie-cutter instructions. Sometimes you have to adapt your knowledge to the way the problem is presented to you. Inconsistent (/"incomprehensible") instructions are part of that.

@Songfugel Ай бұрын

This is insanely simple if it is made clear that you are allowed to rearrange the digits, which you usually aren't allowed to do in similar questions. Which btw is not mentioned anywhere in the question, and the unordered list of the digits would also imply that this is the case here as well Other than that, I don't see how this could pose any problems for anyone above 2nd grade

@lemonlord5550 Ай бұрын

3:28 when it's written like this it is suddenly so painfully simple.

@aaronrobinson4170 Ай бұрын

I had to look up what an addend was but after that I realized this was a question about understanding digit placements.

@eamonnsiocain6454 Ай бұрын

This problem baffles only those who have not listened to their Math Teachers.

@yippee8570 Ай бұрын

Well, no. It baffles those who have never heard of an 'addend' because it's a new word. It's definitely not a word I or my children have heard

@Misteribel Ай бұрын

Nobody has math teachers at 7yo. Maybe you learn to count beans, or add and subtract. But math, no. That starts in most countries once you're a teenager.

@SC-gs8dc Ай бұрын

@@yippee8570I guess this depends on where you were raised and what you remember of what you learned as a child. All I can say is we learned those words in math in grade 1 or 2 when I was in school 40 years ago in Canada. (I still think the word subtrahend is weird!)

@yippee8570 Ай бұрын

@@SC-gs8dc it must do. It's not a word used in the UK, I'm fairly certain.

@Skank_and_Gutterboy Ай бұрын

@@Misteribel Exactly, this problem was given to 2nd graders? BS. The vid poster does this all the time and likes to imply, "A bunch of 8 year olds got this, what's wrong with you?" In the 2nd grade, you're learning to add and subtract through A LOT of repetition. They're not throwing this at you. You don't do anything with equations until the 5th or 6th grade, up until 99% of what you do it simplifying expressions. You may dabble a little in inequalities, number bases, and set theory (which is totally worthless, probably just used as a filler because you can only do so much add/subtract/multiply/divide).

@gabrielgrey2708 Ай бұрын

6+62+288+1000 = 1356. Nowhere is it stated that only the given digits can be used.

@arandombard1197 Ай бұрын

Except it does. You're given 10 digits to use.

@gabrielgrey2708 Ай бұрын

@@arandombard1197 Firstly, there are 9, not 10 given digits. But secondly, and more importantly, it is not stated that you are not allowed to use other digits, only that the listed gidits have to be used.

@arandombard1197 Ай бұрын

@@gabrielgrey2708 It doesn't say you can use other digits. It says you can use these digits. It then gives you the format that those digits must be used in. Pay attention.

@gabrielgrey2708 Ай бұрын

@@arandombard1197 The problem states "use all of these digits", and my solution does use all of those digits. The format is just the preferred format of Presh, not a part of the original problem.

@rdbchase Күн бұрын

@@arandombard1197 Wrong -- you're making unstated assumptions. There are an infinite number of solutions to the problem stated, which does not preclude using digits other than those listed, does not restrict the number of addends to three, and does not limit the number of digits they contain (so long as the sum includes a one-digit, two-digit, and three-digit addend).

@beepbop6697 10 күн бұрын

Had never heard the words "addend" and "augend" before -- I got up to multivariable calculus in college. Learned something new today.

@handanyldzhan9232 Ай бұрын

Since we're supposed to add up 1, 2 and 3-digit numbers together, the sum must have 3 digits too. Also, the most-significant digits of both the 3-digit addend and sum must be the same because all the digits are even numbers. abc de f agh c+e+f is either below 10 or above 19. If there's no 8 among them, at least one 0 is used: 0+2+6=8 0+0+6=6 0+0+2=2 If there's an 8: 0+0+8=8 8+8+6=22 (carry 2) 8+6+6=20 (carry 2) b+d can't exceed 9. d is at least 2, so b

@Tehom1 Ай бұрын

You have a good principled answer. Ruling out the carries first is the way to go if you approach it as a maths problem.

@michaelhallock1428 Ай бұрын

Not buying double zero as a two digit number, but solid framework for solving the problem. Still, I think it's way too hard for a 2nd grader.

@martinferrand4711 Ай бұрын

You don't have to 600+20+8=628 You can swap the digits around no problem

@rdbchase Күн бұрын

@@martinferrand4711 You can use all the digits and addends of any length too -- as stated, the problem has an infinite number of solutions.

@martinferrand4711 Күн бұрын

@@rdbchase that I don't get, there is a finite amount of digit so how can you construct an infinite amount of solution?

@rdbchase Күн бұрын

@@martinferrand4711 Because the problem 1) does not limit the number of addends to three, 2) does not limit the number of digits they contain (so long as the solution contains one-digit, two-digit, and three-digit addends), and 3) does not limit the digits used in the solution to those listed -- there isn't even a proper list of the digits which must be used.

@martinferrand4711 Күн бұрын

@@rdbchase ok if you go under those rules I understand. It was under the impression that the list of number was mandatory and all numbers were to be taken from that list.

@agytjax Ай бұрын

If we solve these kinds of problems, it will only SHRINK my brain, NOT STRETCH them What a complete waste of time ? Why is Presh posting such trivial problems ??

@elLooto 27 күн бұрын

Heres a problem with a trivial proof, that almost no-one seems able to do: Prove that people who work for government pay no tax.

@blackenedmagic888 Ай бұрын

First of all, once I did a search to find out what an "addend" was, it was quite easy for me to find a solution. And, like many others, I had never had a math teacher, professor, etc. ever use the term "addend". Secondly, using "02", etc. and "002", etc. as two and three-digit numbers is invalid - the only times I've ever seen such a notation was when teachers or textbooks used it to explain the addition of numbers with a different number of digits (as in the problem in this video).

@CaptainSweatpants90 28 күн бұрын

I'll be honest, I tried this one for a bit and legitimately failed because I never stopped to think that the 1-digit addend might just be the last digit of the sum. Such a simple, obvious step, and I discarded it right from the get-go.

@ericfuchs123 Ай бұрын

The heck is an addend?

@ZeroGravityDog Ай бұрын

deduce it from the context.

@keith6706 Ай бұрын

Something those students would have been taught before being given the question.

@protonmaster76 Ай бұрын

I struggled to understand the question as it was written. Once i understood the question, I found an answer quickly

@jasonschubert6828 10 күн бұрын

The most difficult part of this problem was knowing what an "addend" was.

@NickKravitz Ай бұрын

The problem doesn't appear to prohibit using decimal separators. Given that we have a 1-digit number as an addend, we can only add decimal separators between the ones and tens places. However, America uses a decimal point while Europe uses a decimal comma. So multiply the final answer by 3.

@yippee8570 Ай бұрын

Only some places in Europe. Please don't group us all together. We're hardly homogenous.

@verkuilb Ай бұрын

Not quite true. You can put the decimal point as: 60.0 + 2.0 + .8 = 62.8 or 6 + 0.2 + 0.08 = 6.28 or .6 + .02 + .008 = .628 etc. And since you're adding decimals, you can also add negative signs and come up with other creative solutions. Here's just one example: 6 + .28 + (-6.28) = 0.00

@clashdevil2925 7 күн бұрын

Someone : i couldn't solve a 2nd grade problem even with an hour help This guy : here are 48 ways to show you that you failed

@capefry8323 Ай бұрын

I had to google the definition of what an "addend" is.

@RobG1729 28 күн бұрын

The pairs of digits and three zeroes clued me in to the answer, and I'd envisioned the addition in columns.

@lesnyk255 15 күн бұрын

My first thought was "What the hell is an 'addend'?"I couldn't even understand the question. I thought it involved addng up the 9 digits after right-padding some of them with 1, 2, or 3 digits. Maybe it would have made sense if I'd had the benefit of classroom context, but I didn't - so it didn't. Kudos to the mom who at least knew what was expected of her.

@user-fr7uz7ixxx Ай бұрын

I really like this problem. It’s the kind that seems hard, then when you figure it out it seems simple.

@mickyderheld Ай бұрын

i was stunned a first and tried to figure it out while you were explaining, it clicked in my brain as soon as you showed 2:55 the pyramid-like thing. really easy solution that shows how much you have to not overthink at problems like that

@gabrielh7517 28 күн бұрын

I didn't even understand the question until he explained but once I understood it took like 10 minutes to play with the numbers to figure it out then it made so much sense

@HeatherAckroyd Ай бұрын

Having never heard of the term "addend" before, I had to google that. Once I knew that was just the numbers being added together, it took about 10 seconds to see that 600 + 20 + 8 = 628, which uses all the digits and has the 1, 2, and 3-digit numbers required to be added together. Not sure why the 7 yo's mother didn't just look up what "addend" meant, if that was her problem.

@honourabledoctoredwinmoria3126 Ай бұрын

I assume that she noticed 6 + 2 = 8 and kept trying to get a solution that incorporated that, without having to use leading 0s.

@billh5923 26 күн бұрын

14 years of math including 2 years of calculus and I don't remember being taught the word addend, but if I replace it with number, I come up with 600 + 20 + 8 = 628.

@CoolCatDoingAKickflip 29 күн бұрын

This problem is probably designed to be able to be arranged any way and still hold true.

@renedekker9806 17 күн бұрын

The most difficult part is understanding the question (does a 7-year old know what an "addend" is?). Once understood, it is pretty easy to an answer.

@shubhambisht9311 Ай бұрын

Bro just put salt by finding not 1 but 48 solutions, 😂

@WolfRose1Studios Ай бұрын

I was getting too much carry over originally before playing the video, once I saw your first step I face palmed and figured out the rules for all the solutions.

@Whenyouarent Ай бұрын

I don’t even know where to start 💀

@davidgriffith3938 16 күн бұрын

Turning the 8's sideways to make infinity symbols will allow a whole new batch of solutions.

@litcrit1624 Ай бұрын

Did it in my head before the pause. Thought there'd be 6 possible answers, but didn't consider the )'s alone or in front for a moment.

@head_snapss7587 Ай бұрын

It's actually interesting how the question is made intentionally with the zeros in mind.

@ilonachan Ай бұрын

bruh, it's a trick question. Beautiful puzzle tbh! I started by thinking about the possible places where carry could occur, only to realize there can never be any carry, meaning the pattern is essentially forced by the addends having to start with a nonzero digit (there's technically two other options if the one-digit addend is 0)

@Jbig1430 2 күн бұрын

The word addend is what confused me in this question I have never used the word addend when working with math questions in my entire life. For something like this is would have said sums most likely.

@GilliganBMT 27 күн бұрын

My holdup was I thought they meant to keep the digits in that order as presented and place two addition sylbols and an equal sign in the spaces to make that line true.

@klightspeed Ай бұрын

3:51 Once I saw that the result was included in the digits used, I quickly saw that a valid solution is units, tens, and hundreds, with the result being a permutation of the distinct non-zero digits.

@Alorand 18 күн бұрын

2:24 I've lived in the US for most of my life and this is the first time I am hearing of "addend", "augend", or "summand".

@anthonycannet1305 Ай бұрын

There are 2 of each number except the 0’s, which there are enough to express a multiple 10 and 100. A number with the digits ABC can be written as A00 + B0 + C. That uses each digit twice and three zeros, there are 6 possible solutions using this formula: 268=200+60+8 286=200+80+6 628=600+20+8 682=600+80+2 826=800+20+6 862=800+60+2 After the step where we figured out that the answer has to be a 3 digit number, I realized the three 0’s meant you could make any 3 digit number and break it into it’s expanded form

@mcb187 13 күн бұрын

Honestly, once I actually understand the question it was really easy. However, I had no idea what the question even was. It was written extremely poorly for sure.

@waynemv Ай бұрын

Among the great many previously published math puzzles people have come up with over the years, there are myriad examples containing phrases like "1-digit", "2-digit", "n-digit number", and the like. Notice that in nearly every case, it is implied, if not outright stated, that the numbers referred to are positive integers without leading zeros. Exceptions to this rule are rare. It is a longstanding convention that "00" does not count as a 2-digit number.

@Kate1427 10 күн бұрын

It’s the terminology used in the question. Wasn’t familiar with the word addend, guessed it meant number but then I pondered if we needed to add additional numbers of 1,2 and 3 digits in length to the listed numbers…sigh

@samuelbidocuello Ай бұрын

Always impressed. What I learned by watching this channel was that you don't actually need to do it the hard way but the smart way. I thought the equation wording was the catch, but didn't notice the trick to pairing the digits. Now I know. Those little things is what I tried to teach my little brother because the hard way is the pathway of highest electrical potential in my brain's medium. And we may entertain the thought, but isn't the way the scientific notation treats the zeros the standard?

@thebe_stone 27 күн бұрын

this is a stretch your thinking problem, which at my school meant it was optional.

@forcelightningcable9639 21 күн бұрын

Well, now I know why I would always hate word problems as a kid

@plentyofpaper 21 күн бұрын

Majored in mechanical engineering, minored in math. I don't think I've ever seen the word "addend" in my life. The - symbols after 1, 2 and 3 also confused me.

@smellydeadcat2178 Ай бұрын

It looks to me like they are really trying to find the gifted students.

@collinriley4585 Ай бұрын

I considered just “0” for the one digit number wasn’t valid, and there’s only six answers.

@yippy8503 Ай бұрын

Since the question just said the equation must have a 1-,2, and a 3-digit addend, I'd like to think it doesn't mean we can only have those three numbers, but we can also add more numbers ourselves. We could add some 4-, 5-digit numbers, or two 3-digit numbers as long as a 1-,2-, 3-digit number is added. Moreover I think we can also use other numbers than 6,2,8,0, as long as we use all those numbers that were required. This would also fulfil the question requirements.

@sm5574 Ай бұрын

I can't imagine any on-level second-graders getting this question right.

@mattm8870 29 күн бұрын

The only thing that confusing in that question at 0:34 is the word addend which I never come across before. But the fact there's 9 digits listed to be used and the fact that digits are repeated means they looking for an answer in the form of X+XX+XXX=XXX. So 6+20+800=826 you can swap the 2, 6 and 8 around.

@AshleyReynolds-vc6ly 14 күн бұрын

Once I realised what the poorly-worded question was asking, it took no time: 600 + 20 + 8 = 628

@emperor3744 Ай бұрын

I am pretty sure the mom noticed 2 + 6 = 8 but couldn't get it to work with the 1, 2 and 3 digits.

@julientaurus4174 11 күн бұрын

It's not precised that you can use each digit only once...

@gm2407 Ай бұрын

It has been so long since I did secondary school maths I could not even remember ever using the term addend to mean the answer to the equasion. Also I read the question as '1-', 'a2-' and three digit addend. I thought it wanted some algebra equasion. Like A squared minus 1 minus a three digit number and incorporate the numbers listed.

@LuanMerlin Ай бұрын

Is there anything about the question that prevents you from adding additional digits to the equation? As long as I add a 1-, a 2-, and a 3-digit number and include all of the 9 required digits, I cannot see a problem in e.g. adding another addend or using other digits than 0, 2, 6 and 8 for the sum?