A decimal fraction is a fraction with a denominator of ten or a power of ten.
A decimal fraction is usually written with a decimal point.
Other examples of decimal fractions are 5/10, 8/100, and 40/10
5/10 = 0.5
8/100 = 0.08
45/1000 = 0.045
0.08 is a decimal fraction. Similarly, 8/100 is also a decimal fraction.
The use of the word 'fraction' in 'decimal fraction' does not mean that we have to write the decimal fraction as 8/100.