Compare 72/84 and 90/30, Which fraction is greater?

Compare 72/84 and 90/30

1^st number: 72/84, 2^nd number: 3 0/30

72/84 is smaller than 90/30

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 84 × 5 = 420,
72/84 = 72 × 5/84 × 5 = 360/420
Likewise, for the 2nd fraction, since 30 × 14 = 420,
90/30 = 90 × 14/30 × 14 = 1260/420
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
360/420 < 1260/420 or 72/84 < 90/30

MathStep (Works offline)

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