Add 28/81 and 12/15
28/81 + 12/15 is 464/405.
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,
28/81 = 28 × 5/81 × 5 = 140/405 - Likewise, for the 2nd fraction, since 15 × 27 = 405,
12/15 = 12 × 27/15 × 27 = 324/405 - Add the two like fractions:
140/405 + 324/405 = 140 + 324/405 = 464/405 - So, 28/81 + 12/15 = 464/405
In mixed form: 159/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/81+12/15 28/81+24/15 28/81+12/30 84/81+12/15 28/81+36/15 28/81+12/45 28/81+60/15 28/81+12/75 28/81+84/15