Compare 21/4 and 40/15
1st number: 5 1/4, 2nd number: 2 10/15
21/4 is greater than 40/15
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
21/4 = 21 × 15/4 × 15 = 315/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
40/15 = 40 × 4/15 × 4 = 160/60 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 315/60 > 160/60 or 21/4 > 40/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4 and 40/15 21/4 and 80/15 21/8 and 40/15 21/4 and 40/30 63/4 and 40/15 21/12 and 40/15 21/4 and 40/45 21/20 and 40/15 21/4 and 40/75 21/28 and 40/15