Add 21/2 and 18/9
1st number: 10 1/2, 2nd number: 2 0/9
21/2 + 18/9 is 25/2.
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,
18/9 = 18 × 2/9 × 2 = 36/18 - Add the two like fractions:
189/18 + 36/18 = 189 + 36/18 = 225/18 - 225/18 simplified gives 25/2
- So, 21/2 + 18/9 = 25/2
In mixed form: 121/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+18/9 21/2+36/9 21/4+18/9 63/2+18/9 21/2+54/9 21/6+18/9 21/2+18/27 21/2+90/9 21/10+18/9 21/2+18/45 21/14+18/9 21/2+18/63