Add 9/12 and 21/24
9/12 + 21/24 is 13/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 24 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
9/12 = 9 × 2/12 × 2 = 18/24 - Likewise, for the 2nd fraction, since 24 × 1 = 24,
21/24 = 21 × 1/24 × 1 = 21/24 - Add the two like fractions:
18/24 + 21/24 = 18 + 21/24 = 39/24 - 39/24 simplified gives 13/8
- So, 9/12 + 21/24 = 13/8
In mixed form: 15/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12+21/24 9/12+42/24 9/24+21/24 9/12+21/48 27/12+21/24 9/12+63/24 9/36+21/24 9/12+21/72 45/12+21/24 9/60+21/24 63/12+21/24 9/84+21/24