Add 4/42 and 21/81
4/42 + 21/81 is 67/189.
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,
4/42 = 4 × 27/42 × 27 = 108/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
21/81 = 21 × 14/81 × 14 = 294/1134 - Add the two like fractions:
108/1134 + 294/1134 = 108 + 294/1134 = 402/1134 - 402/1134 simplified gives 67/189
- So, 4/42 + 21/81 = 67/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+21/81 4/42+42/81 4/84+21/81 12/42+21/81 4/42+63/81 20/42+21/81 28/42+21/81