Decimals are used when representing numbers that are not whole. Such as 1.5, which equals one and one half.
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they use math by counting doses, and they also used fractions, decimals, and basic arithmatic.
Decimals and whole numbers
Fashion designers need to measure the fabric they use. They use fractions and decimals to figure how much they need.
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.
Possibly, as decimals can't be decimals without decimal points.