Add 7/18 and 21/15
1st number: 7/18, 2nd number: 1 6/15
7/18 + 21/15 is 161/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 15 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Likewise, for the 2nd fraction, since 15 × 6 = 90,
21/15 = 21 × 6/15 × 6 = 126/90 - Add the two like fractions:
35/90 + 126/90 = 35 + 126/90 = 161/90 - So, 7/18 + 21/15 = 161/90
In mixed form: 171/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18+21/15 7/18+42/15 7/36+21/15 7/18+21/30 21/18+21/15 7/18+63/15 7/54+21/15 7/18+21/45 35/18+21/15 7/90+21/15 7/18+21/75 49/18+21/15