Add 21/54 and 18/9
1st number: 21/54, 2nd number: 2 0/9
21/54 + 18/9 is 43/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 9 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 54 × 1 = 54,
21/54 = 21 × 1/54 × 1 = 21/54 - Likewise, for the 2nd fraction, since 9 × 6 = 54,
18/9 = 18 × 6/9 × 6 = 108/54 - Add the two like fractions:
21/54 + 108/54 = 21 + 108/54 = 129/54 - 129/54 simplified gives 43/18
- So, 21/54 + 18/9 = 43/18
In mixed form: 27/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+18/9 21/54+36/9 63/54+18/9 21/54+54/9 21/54+18/27 21/54+90/9 21/54+18/45 21/54+18/63