Add 21/9 and 7/5
1st number: 2 3/9, 2nd number: 1 2/5
21/9 + 7/5 is 56/15.
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,
21/9 = 21 × 5/9 × 5 = 105/45 - Likewise, for the 2nd fraction, since 5 × 9 = 45,
7/5 = 7 × 9/5 × 9 = 63/45 - Add the two like fractions:
105/45 + 63/45 = 105 + 63/45 = 168/45 - 168/45 simplified gives 56/15
- So, 21/9 + 7/5 = 56/15
In mixed form: 311/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+7/5 21/9+14/5 21/18+7/5 21/9+7/10 63/9+7/5 21/9+21/5 21/27+7/5 21/9+7/15 21/9+35/5 21/45+7/5 21/9+7/25 21/9+49/5 21/63+7/5 21/9+7/35