Subtract 21/64 from 21/28
21/28 - 21/64 is 27/64.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 64 is 448
Next, find the equivalent fraction of both fractional numbers with denominator 448 - For the 1st fraction, since 28 × 16 = 448,
21/28 = 21 × 16/28 × 16 = 336/448 - Likewise, for the 2nd fraction, since 64 × 7 = 448,
21/64 = 21 × 7/64 × 7 = 147/448 - Subtract the two like fractions:
336/448 - 147/448 = 336 - 147/448 = 189/448 - After reducing the fraction, the answer is 27/64
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-21/64 21/28-42/64 21/56-21/64 63/28-21/64 21/28-63/64 21/84-21/64