The fundamental principal of decimal numbers is that the place value of any digit is ten times that of the place value of the digit to its right. Coventionally, place values with negative and non-negative powers of ten are separated by the decimal point.
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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.
Some decimals are. Counting numbers are a proper subset of decimals.
terminating decimals repeating decimals
When learning money,there will be decimals