Add 35/28 and 21/12
1st number: 1 7/28, 2nd number: 1 9/12
35/28 + 21/12 is 3/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
35/28 = 35 × 3/28 × 3 = 105/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
21/12 = 21 × 7/12 × 7 = 147/84 - Add the two like fractions:
105/84 + 147/84 = 105 + 147/84 = 252/84 - 252/84 simplified gives 3/1
- So, 35/28 + 21/12 = 3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/28+21/12 35/28+42/12 35/56+21/12 35/28+21/24 35/28+63/12 35/84+21/12 35/28+21/36 35/28+21/60 35/28+21/84