Compare 42/15 and 21/10
1st number: 2 12/15, 2nd number: 2 1/10
42/15 is greater than 21/10
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 10 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
42/15 = 42 × 2/15 × 2 = 84/30 - Likewise, for the 2nd fraction, since 10 × 3 = 30,
21/10 = 21 × 3/10 × 3 = 63/30 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 84/30 > 63/30 or 42/15 > 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15 and 21/10 42/15 and 42/10 42/30 and 21/10 42/15 and 21/20 42/15 and 63/10 42/45 and 21/10 42/15 and 21/30 42/75 and 21/10 42/15 and 21/50 42/15 and 21/70