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Based on 10

Example: the numbers we use in everyday life are decimal numbers, because there are 10 of them (0,1,2,3,4,5,6,7,8 and 9).

Often "decimal number" is also used to mean a number that uses a decimal point followed by digits that show a value smaller than one.

Example: 45.6 (forty-five point six) is a decimal number.