Add 9/15 and 18/20
9/15 + 18/20 is 3/2.
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,
9/15 = 9 × 4/15 × 4 = 36/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Add the two like fractions:
36/60 + 54/60 = 36 + 54/60 = 90/60 - 90/60 simplified gives 3/2
- So, 9/15 + 18/20 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+18/20 9/15+36/20 9/30+18/20 9/15+18/40 27/15+18/20 9/15+54/20 9/45+18/20 9/15+18/60 45/15+18/20 9/15+90/20 9/75+18/20 63/15+18/20