Subtract 9/7 from 21/3
1st number: 7 0/3, 2nd number: 1 2/7
21/3 - 9/7 is 40/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 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 7 × 3 = 21,
9/7 = 9 × 3/7 × 3 = 27/21 - Subtract the two like fractions:
147/21 - 27/21 = 147 - 27/21 = 120/21 - After reducing the fraction, the answer is 40/7
- In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-9/7 21/3-18/7 21/6-9/7 21/3-9/14 63/3-9/7 21/3-27/7 21/9-9/7 21/3-9/21 21/3-45/7 21/15-9/7 21/3-9/35 21/3-63/7 21/3-9/49