Add 15/4 and 21/18
1st number: 3 3/4, 2nd number: 1 3/18
15/4 + 21/18 is 59/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
15/4 = 15 × 9/4 × 9 = 135/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Add the two like fractions:
135/36 + 42/36 = 135 + 42/36 = 177/36 - 177/36 simplified gives 59/12
- So, 15/4 + 21/18 = 59/12
In mixed form: 411/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/4+21/18 15/4+42/18 15/8+21/18 15/4+21/36 45/4+21/18 15/4+63/18 15/12+21/18 15/4+21/54 75/4+21/18 15/20+21/18 15/4+21/90 15/28+21/18