Add 28/56 and 21/18
1st number: 28/56, 2nd number: 1 3/18
28/56 + 21/18 is 5/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 18 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 56 × 9 = 504,
28/56 = 28 × 9/56 × 9 = 252/504 - Likewise, for the 2nd fraction, since 18 × 28 = 504,
21/18 = 21 × 28/18 × 28 = 588/504 - Add the two like fractions:
252/504 + 588/504 = 252 + 588/504 = 840/504 - 840/504 simplified gives 5/3
- So, 28/56 + 21/18 = 5/3
In mixed form: 12/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/56+42/18 28/56+21/36 84/56+21/18 28/56+63/18 28/56+21/54 28/56+21/90