Add 21/45 and 63/64
21/45 + 63/64 is 1393/960.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 64 is 2880
Next, find the equivalent fraction of both fractional numbers with denominator 2880 - For the 1st fraction, since 45 × 64 = 2880,
21/45 = 21 × 64/45 × 64 = 1344/2880 - Likewise, for the 2nd fraction, since 64 × 45 = 2880,
63/64 = 63 × 45/64 × 45 = 2835/2880 - Add the two like fractions:
1344/2880 + 2835/2880 = 1344 + 2835/2880 = 4179/2880 - 4179/2880 simplified gives 1393/960
- So, 21/45 + 63/64 = 1393/960
In mixed form: 1433/960
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+63/64 21/90+63/64 63/45+63/64