Compare 42/15 and 21/42
1st number: 2 12/15, 2nd number: 21/42
42/15 is greater than 21/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
42/15 = 42 × 14/15 × 14 = 588/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 588/210 > 105/210 or 42/15 > 21/42
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 21/42 42/30 and 21/42 42/15 and 21/84 42/15 and 63/42 42/45 and 21/42 42/75 and 21/42