Subtract 63/64 from 21/15
1st number: 1 6/15, 2nd number: 63/64
21/15 - 63/64 is 133/320.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 64 is 960
Next, find the equivalent fraction of both fractional numbers with denominator 960 - For the 1st fraction, since 15 × 64 = 960,
21/15 = 21 × 64/15 × 64 = 1344/960 - Likewise, for the 2nd fraction, since 64 × 15 = 960,
63/64 = 63 × 15/64 × 15 = 945/960 - Subtract the two like fractions:
1344/960 - 945/960 = 1344 - 945/960 = 399/960 - After reducing the fraction, the answer is 133/320
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-63/64 21/30-63/64 63/15-63/64 21/45-63/64 21/75-63/64