One way to write 125 as a fraction is 125/1. In order for a fraction to equal 125, the denominator divided by the numerator must equal 125.

The top number of a fraction is the numerator, and the bottom number is the denominator. If the denominator is equal to 1, the value of the fraction is equal to the numerator. When the numerator's value is higher than the value of the denominator, the fraction is referred to as an improper fraction. Any fraction equal to 125 is an improper fraction. Among other fractions equal to 125 are 250/2, 375/3, 500/4 and 1250/10.