Add 18/56 and 9/21
18/56 + 9/21 is 3/4.
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,
9/21 = 9 × 8/21 × 8 = 72/168 - Add the two like fractions:
54/168 + 72/168 = 54 + 72/168 = 126/168 - 126/168 simplified gives 3/4
- So, 18/56 + 9/21 = 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/56+9/21 18/56+18/21 18/56+9/42 54/56+9/21 18/56+27/21 18/56+9/63 90/56+9/21 18/56+45/21 18/56+63/21