Add 42/15 and 54/81
1st number: 2 12/15, 2nd number: 54/81
42/15 + 54/81 is 52/15.
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,
42/15 = 42 × 27/15 × 27 = 1134/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
54/81 = 54 × 5/81 × 5 = 270/405 - Add the two like fractions:
1134/405 + 270/405 = 1134 + 270/405 = 1404/405 - 1404/405 simplified gives 52/15
- So, 42/15 + 54/81 = 52/15
In mixed form: 37/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+54/81 42/30+54/81 42/45+54/81 42/75+54/81