Add 28/36 and 63/21
1st number: 28/36, 2nd number: 3 0/21
28/36 + 63/21 is 34/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
28/36 = 28 × 7/36 × 7 = 196/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
63/21 = 63 × 12/21 × 12 = 756/252 - Add the two like fractions:
196/252 + 756/252 = 196 + 756/252 = 952/252 - 952/252 simplified gives 34/9
- So, 28/36 + 63/21 = 34/9
In mixed form: 37/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/36+63/21 28/72+63/21 28/36+63/42 84/36+63/21