Add 21/3 and 81/54
1st number: 7 0/3, 2nd number: 1 27/54
21/3 + 81/54 is 17/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 54 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 3 × 18 = 54,
21/3 = 21 × 18/3 × 18 = 378/54 - Likewise, for the 2nd fraction, since 54 × 1 = 54,
81/54 = 81 × 1/54 × 1 = 81/54 - Add the two like fractions:
378/54 + 81/54 = 378 + 81/54 = 459/54 - 459/54 simplified gives 17/2
- So, 21/3 + 81/54 = 17/2
In mixed form: 81/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+81/54 21/6+81/54 63/3+81/54 21/9+81/54 21/15+81/54