Add 28/15 and 42/90
1st number: 1 13/15, 2nd number: 42/90
28/15 + 42/90 is 7/3.
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,
28/15 = 28 × 6/15 × 6 = 168/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
42/90 = 42 × 1/90 × 1 = 42/90 - Add the two like fractions:
168/90 + 42/90 = 168 + 42/90 = 210/90 - 210/90 simplified gives 7/3
- So, 28/15 + 42/90 = 7/3
In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15+42/90 28/15+84/90 28/30+42/90 84/15+42/90 28/45+42/90 28/75+42/90