To turn a decimal into a fraction, first notice that the number to the right of the decimal point is 625. The 6 represents the tens, the 2 represents the hundreds, and the 5 represents the thousands. So, we can put 625 over 1000 or 625/1000.
Notice that the fraction
is not in lowest terms. To turn the fraction into lowest terms, we can divide both the numerator and the denominator by 125.
÷
=

Therefore, .625 can be written as the fraction 5/8, which is in lowest terms.