Add 6/7 and 21/30
6/7 + 21/30 is 109/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 7 × 30 = 210,
6/7 = 6 × 30/7 × 30 = 180/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Add the two like fractions:
180/210 + 147/210 = 180 + 147/210 = 327/210 - 327/210 simplified gives 109/70
- So, 6/7 + 21/30 = 109/70
In mixed form: 139/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/7+21/30 6/7+42/30 6/14+21/30 6/7+21/60 18/7+21/30 6/7+63/30 6/21+21/30 6/7+21/90 30/7+21/30 6/35+21/30 42/7+21/30 6/49+21/30