Here we will convert the number 31.91 to a fraction.
31.91 is the same as 31.91/1, because 31.91 divided by 1 is 31.91.
Therefore, we can multiply both the numerator and denominator in 31.91/1 by 100 to get rid of the decimal point and make it into a fraction as follows:
31.91/1 x 100/100 = 3191/100
Then, we simplify the fraction if necessary and we have our answer:
31.91 = 31 91/100
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