Add 21/7 and 2/8
1st number: 3 0/7, 2nd number: 2/8
21/7 + 2/8 is 13/4.
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,
21/7 = 21 × 8/7 × 8 = 168/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
2/8 = 2 × 7/8 × 7 = 14/56 - Add the two like fractions:
168/56 + 14/56 = 168 + 14/56 = 182/56 - 182/56 simplified gives 13/4
- So, 21/7 + 2/8 = 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: 42/7+2/8 21/7+4/8 21/14+2/8 21/7+2/16 63/7+2/8 21/7+6/8 21/7+2/24 21/7+10/8 21/35+2/8 21/7+2/40 21/7+14/8 21/49+2/8 21/7+2/56