Add 5/15 and 21/12
1st number: 5/15, 2nd number: 1 9/12
5/15 + 21/12 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,
5/15 = 5 × 4/15 × 4 = 20/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
20/60 + 105/60 = 20 + 105/60 = 125/60 - 125/60 simplified gives 25/12
- So, 5/15 + 21/12 = 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: 10/15+21/12 5/15+42/12 5/30+21/12 5/15+21/24 5/15+63/12 5/45+21/12 5/15+21/36 25/15+21/12 5/75+21/12 5/15+21/60 35/15+21/12 5/15+21/84