Add 8/15 and 42/81
8/15 + 42/81 is 142/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
8/15 = 8 × 27/15 × 27 = 216/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
42/81 = 42 × 5/81 × 5 = 210/405 - Add the two like fractions:
216/405 + 210/405 = 216 + 210/405 = 426/405 - 426/405 simplified gives 142/135
- So, 8/15 + 42/81 = 142/135
In mixed form: 17/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15+42/81 8/15+84/81 8/30+42/81 24/15+42/81 8/45+42/81 40/15+42/81 8/75+42/81 56/15+42/81