Add 12/15 and 28/90
12/15 + 28/90 is 10/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
12/15 = 12 × 6/15 × 6 = 72/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
28/90 = 28 × 1/90 × 1 = 28/90 - Add the two like fractions:
72/90 + 28/90 = 72 + 28/90 = 100/90 - 100/90 simplified gives 10/9
- So, 12/15 + 28/90 = 10/9
In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15+28/90 12/15+56/90 12/30+28/90 36/15+28/90 12/15+84/90 12/45+28/90 60/15+28/90 12/75+28/90 84/15+28/90