Add 15/18 and 3/7
15/18 + 3/7 is 53/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
15/18 = 15 × 7/18 × 7 = 105/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
3/7 = 3 × 18/7 × 18 = 54/126 - Add the two like fractions:
105/126 + 54/126 = 105 + 54/126 = 159/126 - 159/126 simplified gives 53/42
- So, 15/18 + 3/7 = 53/42
In mixed form: 111/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+3/7 15/18+6/7 15/36+3/7 15/18+3/14 45/18+3/7 15/18+9/7 15/54+3/7 15/18+3/21 75/18+3/7 15/18+15/7 15/90+3/7 15/18+3/35 15/18+21/7 15/18+3/49