Add 15/42 and 3/81
15/42 + 3/81 is 149/378.
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,
15/42 = 15 × 27/42 × 27 = 405/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
3/81 = 3 × 14/81 × 14 = 42/1134 - Add the two like fractions:
405/1134 + 42/1134 = 405 + 42/1134 = 447/1134 - 447/1134 simplified gives 149/378
- So, 15/42 + 3/81 = 149/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+3/81 15/42+6/81 15/84+3/81 45/42+3/81 15/42+9/81 75/42+3/81 15/42+15/81 15/42+21/81