Add 15/18 and 21/9
1st number: 15/18, 2nd number: 2 3/9
15/18 + 21/9 is 19/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 9 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
15/18 = 15 × 1/18 × 1 = 15/18 - Likewise, for the 2nd fraction, since 9 × 2 = 18,
21/9 = 21 × 2/9 × 2 = 42/18 - Add the two like fractions:
15/18 + 42/18 = 15 + 42/18 = 57/18 - 57/18 simplified gives 19/6
- So, 15/18 + 21/9 = 19/6
In mixed form: 31/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+21/9 15/18+42/9 15/36+21/9 15/18+21/18 45/18+21/9 15/18+63/9 15/54+21/9 15/18+21/27 75/18+21/9 15/90+21/9 15/18+21/45 15/18+21/63