The easiest way is with a calculator! But it's also quite easy without one...
Simply take the numbers after the decimal point, and make them your numerator.
And to get your denominator, use an appropriate power of 10. There are a number of ways to figure this out, and it will quickly become second nature. It might help you to consider that the denominator will have as many 0s as the fraction has units after the decimal point (eg. 0.0304 has 4 digits, so the denominator will be a 1 followed by four 0s: 10000).
So for 0.003, the numerator is 3 and the denominator will be 1000 = 3/1000 (hence why 0.003 can be verbalised as "3 thousandths").
For 0.44 it will be 44/100, which you can then simplify to =22/50=11/25
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0.4 as a fraction and decimal
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].
It is called a decimal fraction.
That already is a decimal fraction.
930 is not a fraction but as a decimal, it is 930