Add 14/21 and 28/81
14/21 + 28/81 is 82/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
14/21 = 14 × 27/21 × 27 = 378/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
28/81 = 28 × 7/81 × 7 = 196/567 - Add the two like fractions:
378/567 + 196/567 = 378 + 196/567 = 574/567 - 574/567 simplified gives 82/81
- So, 14/21 + 28/81 = 82/81
In mixed form: 11/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/21+28/81 14/21+56/81 14/42+28/81 42/21+28/81 14/21+84/81 14/63+28/81 70/21+28/81 98/21+28/81