Add 15/5 and 21/9
1st number: 3 0/5, 2nd number: 2 3/9
15/5 + 21/9 is 16/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
15/5 = 15 × 9/5 × 9 = 135/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Add the two like fractions:
135/45 + 105/45 = 135 + 105/45 = 240/45 - 240/45 simplified gives 16/3
- So, 15/5 + 21/9 = 16/3
In mixed form: 51/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/5+21/9 15/5+42/9 15/10+21/9 15/5+21/18 45/5+21/9 15/5+63/9 15/5+21/27 75/5+21/9 15/25+21/9 15/5+21/45 15/35+21/9 15/5+21/63