Question

A decimal is a fraction that has a denominator of 100.

Answer 1

Sometimes a decimal is a fraction that has a denominator of 100.

Explanation:

A decimal number is one that has an integer and a fractional part, usually separated from each other by a period (.). For example, the number 5.8 has an integer part (5) and a fractional or decimal part (0.8).

As a decimal number it can be understood as a decimal fraction, and taking into account that the word "Decimal" means "based on 10", a decimal fraction is a fraction where the denominator (the number below) is 10, 100, 1000 or any other power of ten.

For example, 2.3 is
`(23)/(10)`, 13.76 is
`(1376)/(100)` and 2.987 is
`(2987)/(1000)`. So, decimal is a fraction that has a power of 10 as a denominator, but does not necessarily have a denominator of 100. Although sometimes it can happen because 100 is a power of 10 (10²)

Answer 2

A decimal fraction is a fraction whose denominator we understand to be a power of 10. (sometimes we do not write the dominator but we understand that eg. 0.2=2/10). Saying that a decimal is a fraction that has a denominator of 100 is not a general rule, but there can be a decimal fraction that has that dominator eg. 0.22 = 22/100