Add 30/15 and 21/90
1st number: 2 0/15, 2nd number: 21/90
30/15 + 21/90 is 67/30.
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,
30/15 = 30 × 6/15 × 6 = 180/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
180/90 + 21/90 = 180 + 21/90 = 201/90 - 201/90 simplified gives 67/30
- So, 30/15 + 21/90 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+21/90 30/15+42/90 90/15+21/90 30/15+63/90 30/45+21/90 30/75+21/90