Add 18/9 and 21/36
1st number: 2 0/9, 2nd number: 21/36
18/9 + 21/36 is 31/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
18/9 = 18 × 4/9 × 4 = 72/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
21/36 = 21 × 1/36 × 1 = 21/36 - Add the two like fractions:
72/36 + 21/36 = 72 + 21/36 = 93/36 - 93/36 simplified gives 31/12
- So, 18/9 + 21/36 = 31/12
In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9+21/36 18/9+42/36 18/9+21/72 54/9+21/36 18/9+63/36 18/27+21/36 90/9+21/36 18/45+21/36 18/63+21/36