A decimal number is one in which the place value of each digit is ten times the place value of the digit to its right. (... , thousands, hundreds, tens, units, tenths, hundredths, ... ) A decimal point is used to separate the units from the tenths.
If a number in decimal form has non-zero digits after the decimal point then it is a decimal fraction. [There is one esoteric exception: if the decimal point is followed by an infinite string of 9s, then it is not a decimal fraction.]
Thus
37.6 is a decimal fraction
0.6 is a decimal fraction
0.00000063 is a decimal fraction
37 is not a decimal fraction.
37.0 is not a decimal fraction.
37.999... recurring is no a decimal fraction [it is in fact = 38].
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It is: 27.3% = 0.273 as a decimal and 273/1000 as a fraction
If you mean recurring decimal 3 then it is 77/15 as an improper fraction
17 is already in decimal. If you mean 1/7 (the fraction) then it's 0.142857, and the 142857 in the fraction part repeats forever.
If you mean: 0.3 then it is 3/10
It already is. 0.25 is 0.25 as a decimal! If you mean 'what is 0.25 as a fraction' it is 1/4