Add 9/15 and 9/20
9/15 + 9/20 is 21/20.
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,
9/15 = 9 × 4/15 × 4 = 36/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
9/20 = 9 × 3/20 × 3 = 27/60 - Add the two like fractions:
36/60 + 27/60 = 36 + 27/60 = 63/60 - 63/60 simplified gives 21/20
- So, 9/15 + 9/20 = 21/20
In mixed form: 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+9/20 9/15+18/20 9/30+9/20 9/15+9/40 27/15+9/20 9/15+27/20 9/45+9/20 9/15+9/60 45/15+9/20 9/15+45/20 9/75+9/20 63/15+9/20 9/15+63/20