The mixed number 81 11/80 written as an improper fraction is 6491/80
To turn the mixed number 81 11/80 into an improper fraction, use these simple steps:
First, multiply the whole number by the denominator of the fractional part: 81 × 80 = 6480.
After that, add the result to the numerator of the fractional part: 6480 + 11 = 6491.
Next, Write the sum of the previous step on the original denominator: 6491/80.
This means that 81 11/80, as an improper fraction, equals 6491/80.
See also: 81 11/80 as a decimal