Compare 84/80 and 20/81, Which fraction is greater?

Compare 84/80 and 20/81

1^st number: 1 4/80, 2^nd number: 20/81

84/80 is greater than 20/81

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 81 is 6480

Next, find the equivalent fraction of both fractional numbers with denominator 6480
For the 1st fraction, since 80 × 81 = 6480,
84/80 = 84 × 81/80 × 81 = 6804/6480
Likewise, for the 2nd fraction, since 81 × 80 = 6480,
20/81 = 20 × 80/81 × 80 = 1600/6480
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
6804/6480 > 1600/6480 or 84/80 > 20/81

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad