Add 18/81 and 42/15
1st number: 18/81, 2nd number: 2 12/15
18/81 + 42/15 is 136/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 15 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Likewise, for the 2nd fraction, since 15 × 27 = 405,
42/15 = 42 × 27/15 × 27 = 1134/405 - Add the two like fractions:
90/405 + 1134/405 = 90 + 1134/405 = 1224/405 - 1224/405 simplified gives 136/45
- So, 18/81 + 42/15 = 136/45
In mixed form: 31/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/81+42/15 18/81+84/15 18/81+42/30 54/81+42/15 18/81+42/45 90/81+42/15 18/81+42/75