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