Compare 21/30 and 4/21
21/30 is greater than 4/21
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,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
4/21 = 4 × 10/21 × 10 = 40/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/210 > 40/210 or 21/30 > 4/21
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 4/21 21/30 and 8/21 21/60 and 4/21 21/30 and 4/42 63/30 and 4/21 21/30 and 12/21 21/90 and 4/21 21/30 and 4/63 21/30 and 20/21 21/30 and 28/21