Add 9/15 and 21/54
9/15 + 21/54 is 89/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
9/15 = 9 × 18/15 × 18 = 162/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Add the two like fractions:
162/270 + 105/270 = 162 + 105/270 = 267/270 - 267/270 simplified gives 89/90
- So, 9/15 + 21/54 = 89/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15+21/54 9/15+42/54 9/30+21/54 27/15+21/54 9/15+63/54 9/45+21/54 45/15+21/54 9/75+21/54 63/15+21/54