Add 15/45 and 9/12
15/45 + 9/12 is 13/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
15/45 = 15 × 4/45 × 4 = 60/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
9/12 = 9 × 15/12 × 15 = 135/180 - Add the two like fractions:
60/180 + 135/180 = 60 + 135/180 = 195/180 - 195/180 simplified gives 13/12
- So, 15/45 + 9/12 = 13/12
In mixed form: 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45+9/12 15/45+18/12 15/90+9/12 15/45+9/24 15/45+27/12 15/45+9/36 75/45+9/12 15/45+45/12 15/45+9/60 15/45+63/12 15/45+9/84