Add 18/56 and 30/21
1st number: 18/56, 2nd number: 1 9/21
18/56 + 30/21 is 7/4.
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,
30/21 = 30 × 8/21 × 8 = 240/168 - Add the two like fractions:
54/168 + 240/168 = 54 + 240/168 = 294/168 - 294/168 simplified gives 7/4
- So, 18/56 + 30/21 = 7/4
In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/56+30/21 18/56+60/21 18/56+30/42 54/56+30/21 18/56+90/21 18/56+30/63 90/56+30/21