Compare 42/30 and 20/21
1st number: 1 12/30, 2nd number: 20/21
42/30 is greater than 20/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 294/210 > 200/210 or 42/30 > 20/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30 and 20/21 42/30 and 40/21 42/60 and 20/21 42/30 and 20/42 42/30 and 60/21 42/90 and 20/21 42/30 and 20/63