Add 9/15 and 81/90
9/15 + 81/90 is 3/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
9/15 = 9 × 6/15 × 6 = 54/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
81/90 = 81 × 1/90 × 1 = 81/90 - Add the two like fractions:
54/90 + 81/90 = 54 + 81/90 = 135/90 - 135/90 simplified gives 3/2
- So, 9/15 + 81/90 = 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+81/90 9/30+81/90 27/15+81/90 9/45+81/90 45/15+81/90 9/75+81/90 63/15+81/90