Add 21/7 and 9/8
1st number: 3 0/7, 2nd number: 1 1/8
21/7 + 9/8 is 33/8.
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,
9/8 = 9 × 7/8 × 7 = 63/56 - Add the two like fractions:
168/56 + 63/56 = 168 + 63/56 = 231/56 - 231/56 simplified gives 33/8
- So, 21/7 + 9/8 = 33/8
In mixed form: 41/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+9/8 21/7+18/8 21/14+9/8 21/7+9/16 63/7+9/8 21/7+27/8 21/7+9/24 21/7+45/8 21/35+9/8 21/7+9/40 21/7+63/8 21/49+9/8 21/7+9/56