Add 80/15 and 21/90
1st number: 5 5/15, 2nd number: 21/90
80/15 + 21/90 is 167/30.
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,
80/15 = 80 × 6/15 × 6 = 480/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
480/90 + 21/90 = 480 + 21/90 = 501/90 - 501/90 simplified gives 167/30
- So, 80/15 + 21/90 = 167/30
In mixed form: 517/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15+42/90 80/30+21/90 80/15+63/90 80/45+21/90 80/75+21/90