Add 72/28 and 21/7
1st number: 2 16/28, 2nd number: 3 0/7
72/28 + 21/7 is 39/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
72/28 = 72 × 1/28 × 1 = 72/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
21/7 = 21 × 4/7 × 4 = 84/28 - Add the two like fractions:
72/28 + 84/28 = 72 + 84/28 = 156/28 - 156/28 simplified gives 39/7
- So, 72/28 + 21/7 = 39/7
In mixed form: 54/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/28+42/7 72/56+21/7 72/28+21/14 72/28+63/7 72/84+21/7 72/28+21/35 72/28+21/49