Compare 21/40 and 7/15
21/40 is greater than 7/15
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
7/15 = 7 × 8/15 × 8 = 56/120 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/120 > 56/120 or 21/40 > 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40 and 7/15 21/40 and 14/15 21/80 and 7/15 21/40 and 7/30 63/40 and 7/15 21/40 and 21/15 21/40 and 7/45 21/40 and 35/15 21/40 and 7/75 21/40 and 49/15