Compare 40/15 and 21/12
1st number: 2 10/15, 2nd number: 1 9/12
40/15 is greater than 21/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
40/15 = 40 × 4/15 × 4 = 160/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 160/60 > 105/60 or 40/15 > 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15 and 21/12 40/15 and 42/12 40/30 and 21/12 40/15 and 21/24 40/15 and 63/12 40/45 and 21/12 40/15 and 21/36 40/75 and 21/12 40/15 and 21/60 40/15 and 21/84