Compare 21/30 and 27/21
1st number: 21/30, 2nd number: 1 6/21
21/30 is smaller than 27/21
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,
27/21 = 27 × 10/21 × 10 = 270/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/210 < 270/210 or 21/30 < 27/21
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 27/21 21/30 and 54/21 21/60 and 27/21 21/30 and 27/42 63/30 and 27/21 21/30 and 81/21 21/90 and 27/21 21/30 and 27/63