Compare 3/10 and 7/21
3/10 is smaller than 7/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/210 < 70/210 or 3/10 < 7/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/10 and 7/21 3/10 and 14/21 3/20 and 7/21 3/10 and 7/42 9/10 and 7/21 3/30 and 7/21 3/10 and 7/63 15/10 and 7/21 3/10 and 35/21 3/50 and 7/21 21/10 and 7/21 3/10 and 49/21 3/70 and 7/21