Subtract 21/32 from 7/21
7/21 - 21/32 is -31/96.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 32 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 21 × 32 = 672,
7/21 = 7 × 32/21 × 32 = 224/672 - Likewise, for the 2nd fraction, since 32 × 21 = 672,
21/32 = 21 × 21/32 × 21 = 441/672 - Subtract the two like fractions:
224/672 - 441/672 = 224 - 441/672 = -217/672 - After reducing the fraction, the answer is -31/96
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-21/32 7/21-42/32 7/42-21/32 7/21-21/64 7/21-63/32 7/63-21/32 7/21-21/96 35/21-21/32 49/21-21/32