Add 28/30 and 21/15
1st number: 28/30, 2nd number: 1 6/15
28/30 + 21/15 is 7/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
28/30 = 28 × 1/30 × 1 = 28/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Add the two like fractions:
28/30 + 42/30 = 28 + 42/30 = 70/30 - 70/30 simplified gives 7/3
- So, 28/30 + 21/15 = 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: 56/30+21/15 28/30+42/15 28/60+21/15 28/30+21/30 84/30+21/15 28/30+63/15 28/90+21/15 28/30+21/45 28/30+21/75