Add 21/2 and 12/9
1st number: 10 1/2, 2nd number: 1 3/9
21/2 + 12/9 is 71/6.
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,
12/9 = 12 × 2/9 × 2 = 24/18 - Add the two like fractions:
189/18 + 24/18 = 189 + 24/18 = 213/18 - 213/18 simplified gives 71/6
- So, 21/2 + 12/9 = 71/6
In mixed form: 115/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+12/9 21/2+24/9 21/4+12/9 21/2+12/18 63/2+12/9 21/2+36/9 21/6+12/9 21/2+12/27 21/2+60/9 21/10+12/9 21/2+12/45 21/2+84/9 21/14+12/9 21/2+12/63