The answer to what is .625 as a fraction is as follows:

Write .625 in the form of a simple fraction ie. .625/1.
Multiply both the numerator and the denominator of this simple fraction by 10 for every number present after the decimal point ie. .625*1000/1*1000 = 625/1000.
Now, just reduce this obtained fraction by dividing it by its multiples or common factor.
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