Add 28/42 and 7/81
28/42 + 7/81 is 61/81.
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,
28/42 = 28 × 27/42 × 27 = 756/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
7/81 = 7 × 14/81 × 14 = 98/1134 - Add the two like fractions:
756/1134 + 98/1134 = 756 + 98/1134 = 854/1134 - 854/1134 simplified gives 61/81
- So, 28/42 + 7/81 = 61/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+7/81 28/42+14/81 28/84+7/81 84/42+7/81 28/42+21/81 28/42+35/81 28/42+49/81