Add 80/12 and 9/15
1st number: 6 8/12, 2nd number: 9/15
80/12 + 9/15 is 109/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
80/12 = 80 × 5/12 × 5 = 400/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
9/15 = 9 × 4/15 × 4 = 36/60 - Add the two like fractions:
400/60 + 36/60 = 400 + 36/60 = 436/60 - 436/60 simplified gives 109/15
- So, 80/12 + 9/15 = 109/15
In mixed form: 74/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12+18/15 80/24+9/15 80/12+9/30 80/12+27/15 80/36+9/15 80/12+9/45 80/12+45/15 80/60+9/15 80/12+9/75 80/12+63/15 80/84+9/15