Add 28/64 and 21/30
28/64 + 21/30 is 91/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 64 and 30 is 960
Next, find the equivalent fraction of both fractional numbers with denominator 960 - For the 1st fraction, since 64 × 15 = 960,
28/64 = 28 × 15/64 × 15 = 420/960 - Likewise, for the 2nd fraction, since 30 × 32 = 960,
21/30 = 21 × 32/30 × 32 = 672/960 - Add the two like fractions:
420/960 + 672/960 = 420 + 672/960 = 1092/960 - 1092/960 simplified gives 91/80
- So, 28/64 + 21/30 = 91/80
In mixed form: 111/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/64+21/30 28/64+42/30 28/64+21/60 84/64+21/30 28/64+63/30 28/64+21/90