Add 5/9 and 15/21
5/9 + 15/21 is 80/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
5/9 = 5 × 7/9 × 7 = 35/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
15/21 = 15 × 3/21 × 3 = 45/63 - Add the two like fractions:
35/63 + 45/63 = 35 + 45/63 = 80/63 - So, 5/9 + 15/21 = 80/63
In mixed form: 117/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/9+15/21 5/9+30/21 5/18+15/21 5/9+15/42 15/9+15/21 5/9+45/21 5/27+15/21 5/9+15/63 25/9+15/21 5/9+75/21 5/45+15/21 35/9+15/21 5/63+15/21