The purpose is to separate whole numbers from fractional parts of whole numbers.
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It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.It is a number with a decimal point. It is not necessarily a decimal number because 24 (no decimal pont) is a decimal number.
You write it as 0.004 because to the left of the decimal point is ones, to the first zero to the right of the decimal point is tenths, to the second zero to the right of the decimal point is hundredths, and so on.
34.67, rounded to the nearest decimal point, is 34.7.
A whole number can have (a) no digits after the decimal point - in which case it terminates at the decimal point, or (b) has a non-terminating sequence of 9s immediately after the decimal point.
29 and there is no need for a decimal point after the number.