Add 30/9 and 21/5
1st number: 3 3/9, 2nd number: 4 1/5
30/9 + 21/5 is 113/15.
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,
30/9 = 30 × 5/9 × 5 = 150/45 - Likewise, for the 2nd fraction, since 5 × 9 = 45,
21/5 = 21 × 9/5 × 9 = 189/45 - Add the two like fractions:
150/45 + 189/45 = 150 + 189/45 = 339/45 - 339/45 simplified gives 113/15
- So, 30/9 + 21/5 = 113/15
In mixed form: 78/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9+21/5 30/9+42/5 30/18+21/5 30/9+21/10 90/9+21/5 30/9+63/5 30/27+21/5 30/9+21/15 30/45+21/5 30/9+21/25 30/63+21/5 30/9+21/35