Add 54/18 and 21/28
1st number: 3 0/18, 2nd number: 21/28
54/18 + 21/28 is 15/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 18 × 14 = 252,
54/18 = 54 × 14/18 × 14 = 756/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Add the two like fractions:
756/252 + 189/252 = 756 + 189/252 = 945/252 - 945/252 simplified gives 15/4
- So, 54/18 + 21/28 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18+42/28 54/36+21/28 54/18+21/56 54/18+63/28 54/18+21/84 54/90+21/28