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When you are shopping or rounding decimals to the nearest price!
There are many situations where integers are simply not enough. However, "real numbers" are mainly of theoretical importance; for most practical situations, numbers that have a limited number of decimals work quite well.
(2/3) x 1000 = 2000/3 = 666.66 recurring, in practical situations it is $666.67
Two of them are terminating decimals and recurring decimals
You need decimals when you measure and fractions. You need decimals, because to measure and fractions. Also, so whole numbers could exist if there are decimals. There will be no math if there's no decimals.