Add 56/42 and 21/81
1st number: 1 14/42, 2nd number: 21/81
56/42 + 21/81 is 43/27.
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,
56/42 = 56 × 27/42 × 27 = 1512/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
21/81 = 21 × 14/81 × 14 = 294/1134 - Add the two like fractions:
1512/1134 + 294/1134 = 1512 + 294/1134 = 1806/1134 - 1806/1134 simplified gives 43/27
- So, 56/42 + 21/81 = 43/27
In mixed form: 116/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+42/81 56/84+21/81 56/42+63/81