Subtract 3/32 from 21/28, Solve 21/28

Subtract 3/32 from 21/28

21/28 - 3/32 is 21/32.

Find the least common denominator or LCM of the two denominators:
LCM of 28 and 32 is 224

Next, find the equivalent fraction of both fractional numbers with denominator 224
For the 1st fraction, since 28 × 8 = 224,
21/28 = 21 × 8/28 × 8 = 168/224
Likewise, for the 2nd fraction, since 32 × 7 = 224,
3/32 = 3 × 7/32 × 7 = 21/224
Subtract the two like fractions:
168/224 - 21/224 = 168 - 21/224 = 147/224
After reducing the fraction, the answer is 21/32

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad