Add 84/81 and 21/12
1st number: 1 3/81, 2nd number: 1 9/12
84/81 + 21/12 is 301/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 12 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
84/81 = 84 × 4/81 × 4 = 336/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
21/12 = 21 × 27/12 × 27 = 567/324 - Add the two like fractions:
336/324 + 567/324 = 336 + 567/324 = 903/324 - 903/324 simplified gives 301/108
- So, 84/81 + 21/12 = 301/108
In mixed form: 285/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81+42/12 84/81+21/24 84/81+63/12 84/81+21/36 84/81+21/60 84/81+21/84