Add 20/21 and 63/56
1st number: 20/21, 2nd number: 1 7/56
20/21 + 63/56 is 349/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
20/21 = 20 × 8/21 × 8 = 160/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
63/56 = 63 × 3/56 × 3 = 189/168 - Add the two like fractions:
160/168 + 189/168 = 160 + 189/168 = 349/168 - So, 20/21 + 63/56 = 349/168
In mixed form: 213/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+63/56 20/42+63/56 60/21+63/56 20/63+63/56