Add 20/21 and 21/6
1st number: 20/21, 2nd number: 3 3/6
20/21 + 21/6 is 187/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
21/6 = 21 × 7/6 × 7 = 147/42 - Add the two like fractions:
40/42 + 147/42 = 40 + 147/42 = 187/42 - So, 20/21 + 21/6 = 187/42
In mixed form: 419/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+21/6 20/21+42/6 20/42+21/6 20/21+21/12 60/21+21/6 20/21+63/6 20/63+21/6 20/21+21/18 20/21+21/30 20/21+21/42