Add 15/12 and 21/27
1st number: 1 3/12, 2nd number: 21/27
15/12 + 21/27 is 73/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 27 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 12 × 9 = 108,
15/12 = 15 × 9/12 × 9 = 135/108 - Likewise, for the 2nd fraction, since 27 × 4 = 108,
21/27 = 21 × 4/27 × 4 = 84/108 - Add the two like fractions:
135/108 + 84/108 = 135 + 84/108 = 219/108 - 219/108 simplified gives 73/36
- So, 15/12 + 21/27 = 73/36
In mixed form: 21/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+21/27 15/12+42/27 15/24+21/27 15/12+21/54 45/12+21/27 15/12+63/27 15/36+21/27 15/12+21/81 75/12+21/27 15/60+21/27 15/84+21/27