Add 18/12 and 21/24
1st number: 1 6/12, 2nd number: 21/24
18/12 + 21/24 is 19/8.
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,
18/12 = 18 × 2/12 × 2 = 36/24 - Likewise, for the 2nd fraction, since 24 × 1 = 24,
21/24 = 21 × 1/24 × 1 = 21/24 - Add the two like fractions:
36/24 + 21/24 = 36 + 21/24 = 57/24 - 57/24 simplified gives 19/8
- So, 18/12 + 21/24 = 19/8
In mixed form: 23/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+21/24 18/12+42/24 18/24+21/24 18/12+21/48 54/12+21/24 18/12+63/24 18/36+21/24 18/12+21/72 90/12+21/24 18/60+21/24 18/84+21/24