If you are trying to work out the decimal form of a fraction, such as 4/5, divide the numerator (top number) by the denominator (bottom number). 4/5 = 0.8
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If the number is before the decimal, it is a whole number. The numbers after the decimal represent fractions of whole numbers. For example if you had to work 8.5 hours, you would work 8 whole hours plus one half hour.
It works out that 12 divided by 25 = 0.48 which is a decimal number
No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).
27.9 IS a decimal number. You can tell it is a decimal number because it has a decimal point (.).
7.5 is a decimal.