Add 27/15 and 21/9
1st number: 1 12/15, 2nd number: 2 3/9
27/15 + 21/9 is 62/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
27/15 = 27 × 3/15 × 3 = 81/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Add the two like fractions:
81/45 + 105/45 = 81 + 105/45 = 186/45 - 186/45 simplified gives 62/15
- So, 27/15 + 21/9 = 62/15
In mixed form: 42/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15+21/9 27/15+42/9 27/30+21/9 27/15+21/18 81/15+21/9 27/15+63/9 27/45+21/9 27/15+21/27 27/75+21/9 27/15+21/45 27/15+21/63