Add 20/15 and 9/12
1st number: 1 5/15, 2nd number: 9/12
20/15 + 9/12 is 25/12.
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,
20/15 = 20 × 4/15 × 4 = 80/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
9/12 = 9 × 5/12 × 5 = 45/60 - Add the two like fractions:
80/60 + 45/60 = 80 + 45/60 = 125/60 - 125/60 simplified gives 25/12
- So, 20/15 + 9/12 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+9/12 20/15+18/12 20/30+9/12 20/15+9/24 60/15+9/12 20/15+27/12 20/45+9/12 20/15+9/36 20/15+45/12 20/75+9/12 20/15+9/60 20/15+63/12 20/15+9/84