Subtract 2/10 from 7/21
7/21 - 2/10 is 2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Subtract the two like fractions:
70/210 - 42/210 = 70 - 42/210 = 28/210 - After reducing the fraction, the answer is 2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-2/10 7/21-4/10 7/42-2/10 7/21-2/20 7/21-6/10 7/63-2/10 7/21-2/30 35/21-2/10 7/21-2/50 49/21-2/10 7/21-14/10 7/21-2/70