Add 18/12 and 9/15
1st number: 1 6/12, 2nd number: 9/15
18/12 + 9/15 is 21/10.
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,
18/12 = 18 × 5/12 × 5 = 90/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
9/15 = 9 × 4/15 × 4 = 36/60 - Add the two like fractions:
90/60 + 36/60 = 90 + 36/60 = 126/60 - 126/60 simplified gives 21/10
- So, 18/12 + 9/15 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+9/15 18/12+18/15 18/24+9/15 18/12+9/30 54/12+9/15 18/12+27/15 18/36+9/15 18/12+9/45 90/12+9/15 18/12+45/15 18/60+9/15 18/12+9/75 18/12+63/15 18/84+9/15