Add 21/15 and 63/64
1st number: 1 6/15, 2nd number: 63/64
21/15 + 63/64 is 763/320.
Steps for adding 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 - Add the two like fractions:
1344/960 + 945/960 = 1344 + 945/960 = 2289/960 - 2289/960 simplified gives 763/320
- So, 21/15 + 63/64 = 763/320
In mixed form: 2123/320
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