Subtract 21/49 from 7/56
7/56 - 21/49 is -17/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 49 is 392
Next, find the equivalent fraction of both fractional numbers with denominator 392 - For the 1st fraction, since 56 × 7 = 392,
7/56 = 7 × 7/56 × 7 = 49/392 - Likewise, for the 2nd fraction, since 49 × 8 = 392,
21/49 = 21 × 8/49 × 8 = 168/392 - Subtract the two like fractions:
49/392 - 168/392 = 49 - 168/392 = -119/392 - After reducing the fraction, the answer is -17/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/56-21/49 7/56-42/49 7/56-21/98 21/56-21/49 7/56-63/49 35/56-21/49 49/56-21/49