Add 21/28 and 21/36
21/28 + 21/36 is 4/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Add the two like fractions:
189/252 + 147/252 = 189 + 147/252 = 336/252 - 336/252 simplified gives 4/3
- So, 21/28 + 21/36 = 4/3
In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+21/36 21/28+42/36 21/56+21/36 21/28+21/72 63/28+21/36 21/28+63/36 21/84+21/36