Add 10/15 and 21/18
1st number: 10/15, 2nd number: 1 3/18
10/15 + 21/18 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
10/15 = 10 × 6/15 × 6 = 60/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Add the two like fractions:
60/90 + 105/90 = 60 + 105/90 = 165/90 - 165/90 simplified gives 11/6
- So, 10/15 + 21/18 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/15+21/18 10/15+42/18 10/30+21/18 10/15+21/36 30/15+21/18 10/15+63/18 10/45+21/18 10/15+21/54 50/15+21/18 10/75+21/18 10/15+21/90 70/15+21/18