Add 18/42 and 40/81
18/42 + 40/81 is 523/567.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
18/42 = 18 × 27/42 × 27 = 486/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
40/81 = 40 × 14/81 × 14 = 560/1134 - Add the two like fractions:
486/1134 + 560/1134 = 486 + 560/1134 = 1046/1134 - 1046/1134 simplified gives 523/567
- So, 18/42 + 40/81 = 523/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+40/81 18/42+80/81 18/84+40/81 54/42+40/81 90/42+40/81