Add 18/42 and 9/15
18/42 + 9/15 is 36/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
9/15 = 9 × 14/15 × 14 = 126/210 - Add the two like fractions:
90/210 + 126/210 = 90 + 126/210 = 216/210 - 216/210 simplified gives 36/35
- So, 18/42 + 9/15 = 36/35
In mixed form: 11/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+9/15 18/42+18/15 18/84+9/15 18/42+9/30 54/42+9/15 18/42+27/15 18/42+9/45 90/42+9/15 18/42+45/15 18/42+9/75 18/42+63/15