Compare 21/30 and 10/42
21/30 is greater than 10/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
10/42 = 10 × 5/42 × 5 = 50/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/210 > 50/210 or 21/30 > 10/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30 and 10/42 21/30 and 20/42 21/60 and 10/42 21/30 and 10/84 63/30 and 10/42 21/30 and 30/42 21/90 and 10/42 21/30 and 50/42 21/30 and 70/42