Add 21/9 and 27/18
1st number: 2 3/9, 2nd number: 1 9/18
21/9 + 27/18 is 23/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 9 × 2 = 18,
21/9 = 21 × 2/9 × 2 = 42/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
27/18 = 27 × 1/18 × 1 = 27/18 - Add the two like fractions:
42/18 + 27/18 = 42 + 27/18 = 69/18 - 69/18 simplified gives 23/6
- So, 21/9 + 27/18 = 23/6
In mixed form: 35/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+27/18 21/9+54/18 21/18+27/18 21/9+27/36 63/9+27/18 21/9+81/18 21/27+27/18 21/9+27/54 21/45+27/18 21/9+27/90 21/63+27/18