Add 18/15 and 15/8
1st number: 1 3/15, 2nd number: 1 7/8
18/15 + 15/8 is 123/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
18/15 = 18 × 8/15 × 8 = 144/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
15/8 = 15 × 15/8 × 15 = 225/120 - Add the two like fractions:
144/120 + 225/120 = 144 + 225/120 = 369/120 - 369/120 simplified gives 123/40
- So, 18/15 + 15/8 = 123/40
In mixed form: 33/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+15/8 18/15+30/8 18/30+15/8 18/15+15/16 54/15+15/8 18/15+45/8 18/45+15/8 18/15+15/24 90/15+15/8 18/15+75/8 18/75+15/8 18/15+15/40 18/15+15/56