Add 28/9 and 21/5
1st number: 3 1/9, 2nd number: 4 1/5
28/9 + 21/5 is 329/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 5 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 9 × 5 = 45,
28/9 = 28 × 5/9 × 5 = 140/45 - Likewise, for the 2nd fraction, since 5 × 9 = 45,
21/5 = 21 × 9/5 × 9 = 189/45 - Add the two like fractions:
140/45 + 189/45 = 140 + 189/45 = 329/45 - So, 28/9 + 21/5 = 329/45
In mixed form: 714/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/9+21/5 28/9+42/5 28/18+21/5 28/9+21/10 84/9+21/5 28/9+63/5 28/27+21/5 28/9+21/15 28/45+21/5 28/9+21/25 28/63+21/5 28/9+21/35