Add 12/28 and 21/35
12/28 + 21/35 is 36/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 35 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
12/28 = 12 × 5/28 × 5 = 60/140 - Likewise, for the 2nd fraction, since 35 × 4 = 140,
21/35 = 21 × 4/35 × 4 = 84/140 - Add the two like fractions:
60/140 + 84/140 = 60 + 84/140 = 144/140 - 144/140 simplified gives 36/35
- So, 12/28 + 21/35 = 36/35
In mixed form: 11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28+21/35 12/28+42/35 12/56+21/35 12/28+21/70 36/28+21/35 12/28+63/35 12/84+21/35 60/28+21/35 84/28+21/35