Add 18/56 and 54/21
1st number: 18/56, 2nd number: 2 12/21
18/56 + 54/21 is 81/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
18/56 = 18 × 3/56 × 3 = 54/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
54/21 = 54 × 8/21 × 8 = 432/168 - Add the two like fractions:
54/168 + 432/168 = 54 + 432/168 = 486/168 - 486/168 simplified gives 81/28
- So, 18/56 + 54/21 = 81/28
In mixed form: 225/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/56+54/21 18/56+54/42 54/56+54/21 18/56+54/63 90/56+54/21