Compare 42/15 and 30/20
1st number: 2 12/15, 2nd number: 1 10/20
42/15 is greater than 30/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
42/15 = 42 × 4/15 × 4 = 168/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
30/20 = 30 × 3/20 × 3 = 90/60 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 168/60 > 90/60 or 42/15 > 30/20
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 30/20 42/15 and 60/20 42/30 and 30/20 42/15 and 30/40 42/15 and 90/20 42/45 and 30/20 42/15 and 30/60 42/75 and 30/20