Add 6/21 and 21/30
6/21 + 21/30 is 69/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
6/21 = 6 × 10/21 × 10 = 60/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Add the two like fractions:
60/210 + 147/210 = 60 + 147/210 = 207/210 - 207/210 simplified gives 69/70
- So, 6/21 + 21/30 = 69/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+21/30 6/21+42/30 6/42+21/30 6/21+21/60 18/21+21/30 6/21+63/30 6/63+21/30 6/21+21/90 30/21+21/30 42/21+21/30