Add 5/15 and 21/27
5/15 + 21/27 is 10/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135
Next, find the equivalent fraction of both fractional numbers with denominator 135 - For the 1st fraction, since 15 × 9 = 135,
5/15 = 5 × 9/15 × 9 = 45/135 - Likewise, for the 2nd fraction, since 27 × 5 = 135,
21/27 = 21 × 5/27 × 5 = 105/135 - Add the two like fractions:
45/135 + 105/135 = 45 + 105/135 = 150/135 - 150/135 simplified gives 10/9
- So, 5/15 + 21/27 = 10/9
In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15+21/27 5/15+42/27 5/30+21/27 5/15+21/54 5/15+63/27 5/45+21/27 5/15+21/81 25/15+21/27 5/75+21/27 35/15+21/27