Subtract 10/21 from 21/3
1st number: 7 0/3, 2nd number: 10/21
21/3 - 10/21 is 137/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
21/3 = 21 × 7/3 × 7 = 147/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
10/21 = 10 × 1/21 × 1 = 10/21 - Subtract the two like fractions:
147/21 - 10/21 = 147 - 10/21 = 137/21 - In mixed form: 611/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-10/21 21/3-20/21 21/6-10/21 21/3-10/42 63/3-10/21 21/3-30/21 21/9-10/21 21/3-10/63 21/3-50/21 21/15-10/21 21/3-70/21