Add 12/15 and 28/20
1st number: 12/15, 2nd number: 1 8/20
12/15 + 28/20 is 11/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
12/15 = 12 × 4/15 × 4 = 48/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
28/20 = 28 × 3/20 × 3 = 84/60 - Add the two like fractions:
48/60 + 84/60 = 48 + 84/60 = 132/60 - 132/60 simplified gives 11/5
- So, 12/15 + 28/20 = 11/5
In mixed form: 21/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15+28/20 12/15+56/20 12/30+28/20 12/15+28/40 36/15+28/20 12/15+84/20 12/45+28/20 12/15+28/60 60/15+28/20 12/75+28/20 84/15+28/20