Add 21/3 and 81/18
1st number: 7 0/3, 2nd number: 4 9/18
21/3 + 81/18 is 23/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 3 × 6 = 18,
21/3 = 21 × 6/3 × 6 = 126/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
81/18 = 81 × 1/18 × 1 = 81/18 - Add the two like fractions:
126/18 + 81/18 = 126 + 81/18 = 207/18 - 207/18 simplified gives 23/2
- So, 21/3 + 81/18 = 23/2
In mixed form: 111/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+81/18 21/6+81/18 21/3+81/36 63/3+81/18 21/9+81/18 21/3+81/54 21/15+81/18 21/3+81/90