Add 30/7 and 21/8
1st number: 4 2/7, 2nd number: 2 5/8
30/7 + 21/8 is 387/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
30/7 = 30 × 8/7 × 8 = 240/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
21/8 = 21 × 7/8 × 7 = 147/56 - Add the two like fractions:
240/56 + 147/56 = 240 + 147/56 = 387/56 - So, 30/7 + 21/8 = 387/56
In mixed form: 651/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/7+21/8 30/7+42/8 30/14+21/8 30/7+21/16 90/7+21/8 30/7+63/8 30/21+21/8 30/7+21/24 30/35+21/8 30/7+21/40 30/49+21/8 30/7+21/56