Add 21/9 and 45/18
1st number: 2 3/9, 2nd number: 2 9/18
21/9 + 45/18 is 29/6.
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,
45/18 = 45 × 1/18 × 1 = 45/18 - Add the two like fractions:
42/18 + 45/18 = 42 + 45/18 = 87/18 - 87/18 simplified gives 29/6
- So, 21/9 + 45/18 = 29/6
In mixed form: 45/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+45/18 21/9+90/18 21/18+45/18 21/9+45/36 63/9+45/18 21/27+45/18 21/9+45/54 21/45+45/18 21/9+45/90 21/63+45/18