Add 20/42 and 35/81
20/42 + 35/81 is 515/567.
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,
35/81 = 35 × 14/81 × 14 = 490/1134 - Add the two like fractions:
540/1134 + 490/1134 = 540 + 490/1134 = 1030/1134 - 1030/1134 simplified gives 515/567
- So, 20/42 + 35/81 = 515/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+35/81 20/42+70/81 20/84+35/81 60/42+35/81