Add 6/21 and 7/20
6/21 + 7/20 is 89/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
6/21 = 6 × 20/21 × 20 = 120/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Add the two like fractions:
120/420 + 147/420 = 120 + 147/420 = 267/420 - 267/420 simplified gives 89/140
- So, 6/21 + 7/20 = 89/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+7/20 6/21+14/20 6/42+7/20 6/21+7/40 18/21+7/20 6/21+21/20 6/63+7/20 6/21+7/60 30/21+7/20 6/21+35/20 42/21+7/20 6/21+49/20