Add 21/2 and 28/9
1st number: 10 1/2, 2nd number: 3 1/9
21/2 + 28/9 is 245/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 9 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 2 × 9 = 18,
21/2 = 21 × 9/2 × 9 = 189/18 - Likewise, for the 2nd fraction, since 9 × 2 = 18,
28/9 = 28 × 2/9 × 2 = 56/18 - Add the two like fractions:
189/18 + 56/18 = 189 + 56/18 = 245/18 - So, 21/2 + 28/9 = 245/18
In mixed form: 1311/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+28/9 21/2+56/9 21/4+28/9 21/2+28/18 63/2+28/9 21/2+84/9 21/6+28/9 21/2+28/27 21/10+28/9 21/2+28/45 21/14+28/9 21/2+28/63