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Wellesley College Physics Prof. Glenn Stark explains how to calculate how uncertainties in experimentally measured quantities "propagate". In part 1 he shows how to calculate the uncertainty in a quantity that is obtained by taking the sum or difference of two measured quantities, each of which has an uncertainty associated with it. In part 2 he shows how to calculate the uncertainty in a quantity that is obtained by taking the product of two measured quantities, each of which has an uncertainty associated with it.