Add 15/21 and 63/9
1st number: 15/21, 2nd number: 7 0/9
15/21 + 63/9 is 54/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
15/21 = 15 × 3/21 × 3 = 45/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
63/9 = 63 × 7/9 × 7 = 441/63 - Add the two like fractions:
45/63 + 441/63 = 45 + 441/63 = 486/63 - 486/63 simplified gives 54/7
- So, 15/21 + 63/9 = 54/7
In mixed form: 75/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+63/9 15/42+63/9 15/21+63/18 45/21+63/9 15/63+63/9 15/21+63/27 75/21+63/9 15/21+63/45