Add 18/15 and 7/20
1st number: 1 3/15, 2nd number: 7/20
18/15 + 7/20 is 31/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
18/15 = 18 × 4/15 × 4 = 72/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
7/20 = 7 × 3/20 × 3 = 21/60 - Add the two like fractions:
72/60 + 21/60 = 72 + 21/60 = 93/60 - 93/60 simplified gives 31/20
- So, 18/15 + 7/20 = 31/20
In mixed form: 111/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+7/20 18/15+14/20 18/30+7/20 18/15+7/40 54/15+7/20 18/15+21/20 18/45+7/20 18/15+7/60 90/15+7/20 18/15+35/20 18/75+7/20 18/15+49/20