Subtract 7/21 from 10/56
10/56 - 7/21 is -13/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
10/56 = 10 × 3/56 × 3 = 30/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
7/21 = 7 × 8/21 × 8 = 56/168 - Subtract the two like fractions:
30/168 - 56/168 = 30 - 56/168 = -26/168 - After reducing the fraction, the answer is -13/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/56-7/21 10/56-14/21 10/56-7/42 30/56-7/21 10/56-7/63 50/56-7/21 10/56-35/21 70/56-7/21 10/56-49/21