Subtract 3/64 from 21/56, Solve 21/56

Subtract 3/64 from 21/56

21/56 - 3/64 is 21/64.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 64 is 448

Next, find the equivalent fraction of both fractional numbers with denominator 448
For the 1st fraction, since 56 × 8 = 448,
21/56 = 21 × 8/56 × 8 = 168/448
Likewise, for the 2nd fraction, since 64 × 7 = 448,
3/64 = 3 × 7/64 × 7 = 21/448
Subtract the two like fractions:
168/448 - 21/448 = 168 - 21/448 = 147/448
After reducing the fraction, the answer is 21/64

MathStep (Works offline)

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