Add 28/9 and 21/30
1st number: 3 1/9, 2nd number: 21/30
28/9 + 21/30 is 343/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
28/9 = 28 × 10/9 × 10 = 280/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Add the two like fractions:
280/90 + 63/90 = 280 + 63/90 = 343/90 - So, 28/9 + 21/30 = 343/90
In mixed form: 373/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/9+21/30 28/9+42/30 28/18+21/30 28/9+21/60 84/9+21/30 28/9+63/30 28/27+21/30 28/9+21/90 28/45+21/30 28/63+21/30