Add 2/8 and 21/7
1st number: 2/8, 2nd number: 3 0/7
2/8 + 21/7 is 13/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 7 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 8 × 7 = 56,
2/8 = 2 × 7/8 × 7 = 14/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
21/7 = 21 × 8/7 × 8 = 168/56 - Add the two like fractions:
14/56 + 168/56 = 14 + 168/56 = 182/56 - 182/56 simplified gives 13/4
- So, 2/8 + 21/7 = 13/4
In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8+21/7 2/8+42/7 2/16+21/7 2/8+21/14 6/8+21/7 2/8+63/7 2/24+21/7 10/8+21/7 2/40+21/7 2/8+21/35 14/8+21/7 2/56+21/7 2/8+21/49