Add 1/21 and 7/20
1/21 + 7/20 is 167/420.
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,
1/21 = 1 × 20/21 × 20 = 20/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Add the two like fractions:
20/420 + 147/420 = 20 + 147/420 = 167/420 - So, 1/21 + 7/20 = 167/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+7/20 1/21+14/20 1/42+7/20 1/21+7/40 3/21+7/20 1/21+21/20 1/63+7/20 1/21+7/60 5/21+7/20 1/21+35/20 7/21+7/20 1/21+49/20