Subtract 7/16 from 21/56
21/56 - 7/16 is -1/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 16 is 112
Next, find the equivalent fraction of both fractional numbers with denominator 112 - For the 1st fraction, since 56 × 2 = 112,
21/56 = 21 × 2/56 × 2 = 42/112 - Likewise, for the 2nd fraction, since 16 × 7 = 112,
7/16 = 7 × 7/16 × 7 = 49/112 - Subtract the two like fractions:
42/112 - 49/112 = 42 - 49/112 = -7/112 - After reducing the fraction, the answer is -1/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-7/16 21/56-14/16 21/56-7/32 63/56-7/16 21/56-21/16 21/56-7/48 21/56-35/16 21/56-7/80 21/56-49/16