Subtract 1/7 from 10/21
10/21 - 1/7 is 1/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
10/21 = 10 × 1/21 × 1 = 10/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
1/7 = 1 × 3/7 × 3 = 3/21 - Subtract the two like fractions:
10/21 - 3/21 = 10 - 3/21 = 7/21 - After reducing the fraction, the answer is 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-1/7 10/21-2/7 10/42-1/7 10/21-1/14 30/21-1/7 10/21-3/7 10/63-1/7 10/21-1/21 50/21-1/7 10/21-5/7 10/21-1/35 70/21-1/7 10/21-1/49