The mixed number 21 72/80 written as an improper fraction is 1752/80
To turn the mixed number 21 72/80 into an improper fraction, use these simple steps:
First, multiply the whole number by the denominator of the fractional part: 21 × 80 = 1680.
After that, add the result to the numerator of the fractional part: 1680 + 72 = 1752.
Next, Write the sum of the previous step on the original denominator: 1752/80.
This means that 21 72/80, as an improper fraction, equals 1752/80.
See also: 21 72/80 as a decimal