Subtract 7/21 from 2/10
2/10 - 7/21 is -2/15.
Steps for subtracting 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,
2/10 = 2 × 21/10 × 21 = 42/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Subtract the two like fractions:
42/210 - 70/210 = 42 - 70/210 = -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: 4/10-7/21 2/10-14/21 2/20-7/21 2/10-7/42 6/10-7/21 2/30-7/21 2/10-7/63 2/10-35/21 2/50-7/21 14/10-7/21 2/10-49/21 2/70-7/21