Add 20/42 and 56/81
20/42 + 56/81 is 662/567.
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,
20/42 = 20 × 27/42 × 27 = 540/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
56/81 = 56 × 14/81 × 14 = 784/1134 - Add the two like fractions:
540/1134 + 784/1134 = 540 + 784/1134 = 1324/1134 - 1324/1134 simplified gives 662/567
- So, 20/42 + 56/81 = 662/567
In mixed form: 195/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+56/81 20/84+56/81 60/42+56/81