Add 4/12 and 21/18
1st number: 4/12, 2nd number: 1 3/18
4/12 + 21/18 is 3/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
4/12 = 4 × 3/12 × 3 = 12/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Add the two like fractions:
12/36 + 42/36 = 12 + 42/36 = 54/36 - 54/36 simplified gives 3/2
- So, 4/12 + 21/18 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+21/18 4/12+42/18 4/24+21/18 4/12+21/36 4/12+63/18 4/36+21/18 4/12+21/54 20/12+21/18 4/60+21/18 4/12+21/90 28/12+21/18 4/84+21/18