Add 15/42 and 9/18
15/42 + 9/18 is 6/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
15/42 = 15 × 3/42 × 3 = 45/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
9/18 = 9 × 7/18 × 7 = 63/126 - Add the two like fractions:
45/126 + 63/126 = 45 + 63/126 = 108/126 - 108/126 simplified gives 6/7
- So, 15/42 + 9/18 = 6/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+9/18 15/84+9/18 15/42+9/36 45/42+9/18 15/42+27/18 15/42+9/54 75/42+9/18 15/42+45/18 15/42+9/90 15/42+63/18