The mixed number 21 70/80 written as an improper fraction is 1750/80
To turn the mixed number 21 70/80 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 + 70 = 1750.
Next, Write the sum of the previous step on the original denominator: 1750/80.
This means that 21 70/80, as an improper fraction, equals 1750/80.
See also: 21 70/80 as a decimal