Add 7/21 and 56/63
7/21 + 56/63 is 11/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
7/21 = 7 × 3/21 × 3 = 21/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
56/63 = 56 × 1/63 × 1 = 56/63 - Add the two like fractions:
21/63 + 56/63 = 21 + 56/63 = 77/63 - 77/63 simplified gives 11/9
- So, 7/21 + 56/63 = 11/9
In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+56/63 7/42+56/63 7/63+56/63 35/21+56/63 49/21+56/63