Add 30/15 and 9/12
1st number: 2 0/15, 2nd number: 9/12
30/15 + 9/12 is 11/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
30/15 = 30 × 4/15 × 4 = 120/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
9/12 = 9 × 5/12 × 5 = 45/60 - Add the two like fractions:
120/60 + 45/60 = 120 + 45/60 = 165/60 - 165/60 simplified gives 11/4
- So, 30/15 + 9/12 = 11/4
In mixed form: 23/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+9/12 30/15+18/12 30/15+9/24 90/15+9/12 30/15+27/12 30/45+9/12 30/15+9/36 30/15+45/12 30/75+9/12 30/15+9/60 30/15+63/12 30/15+9/84