Compare 21/63 and 72/40, Which fraction is greater?

Compare 21/63 and 72/40

1^st number: 21/63, 2^nd number: 1 32/40

21/63 is smaller than 72/40

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 40 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 63 × 40 = 2520,
21/63 = 21 × 40/63 × 40 = 840/2520
Likewise, for the 2nd fraction, since 40 × 63 = 2520,
72/40 = 72 × 63/40 × 63 = 4536/2520
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
840/2520 < 4536/2520 or 21/63 < 72/40

MathStep (Works offline)

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