Add 12/15 and 21/6
1st number: 12/15, 2nd number: 3 3/6
12/15 + 21/6 is 43/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 6 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
12/15 = 12 × 2/15 × 2 = 24/30 - Likewise, for the 2nd fraction, since 6 × 5 = 30,
21/6 = 21 × 5/6 × 5 = 105/30 - Add the two like fractions:
24/30 + 105/30 = 24 + 105/30 = 129/30 - 129/30 simplified gives 43/10
- So, 12/15 + 21/6 = 43/10
In mixed form: 43/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15+21/6 12/15+42/6 12/30+21/6 12/15+21/12 36/15+21/6 12/15+63/6 12/45+21/6 12/15+21/18 60/15+21/6 12/75+21/6 12/15+21/30 84/15+21/6 12/15+21/42