Add 5/42 and 15/81
5/42 + 15/81 is 115/378.
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,
5/42 = 5 × 27/42 × 27 = 135/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
15/81 = 15 × 14/81 × 14 = 210/1134 - Add the two like fractions:
135/1134 + 210/1134 = 135 + 210/1134 = 345/1134 - 345/1134 simplified gives 115/378
- So, 5/42 + 15/81 = 115/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42+15/81 5/42+30/81 5/84+15/81 15/42+15/81 5/42+45/81 25/42+15/81 5/42+75/81 35/42+15/81