Add 15/12 and 21/8
1st number: 1 3/12, 2nd number: 2 5/8
15/12 + 21/8 is 31/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
15/12 = 15 × 2/12 × 2 = 30/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
21/8 = 21 × 3/8 × 3 = 63/24 - Add the two like fractions:
30/24 + 63/24 = 30 + 63/24 = 93/24 - 93/24 simplified gives 31/8
- So, 15/12 + 21/8 = 31/8
In mixed form: 37/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+21/8 15/12+42/8 15/24+21/8 15/12+21/16 45/12+21/8 15/12+63/8 15/36+21/8 15/12+21/24 75/12+21/8 15/60+21/8 15/12+21/40 15/84+21/8 15/12+21/56