Add 18/56 and 10/21
18/56 + 10/21 is 67/84.
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,
10/21 = 10 × 8/21 × 8 = 80/168 - Add the two like fractions:
54/168 + 80/168 = 54 + 80/168 = 134/168 - 134/168 simplified gives 67/84
- So, 18/56 + 10/21 = 67/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/56+10/21 18/56+20/21 18/56+10/42 54/56+10/21 18/56+30/21 18/56+10/63 90/56+10/21 18/56+50/21 18/56+70/21