Add 84/12 and 21/81
1st number: 7 0/12, 2nd number: 21/81
84/12 + 21/81 is 196/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
84/12 = 84 × 27/12 × 27 = 2268/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
21/81 = 21 × 4/81 × 4 = 84/324 - Add the two like fractions:
2268/324 + 84/324 = 2268 + 84/324 = 2352/324 - 2352/324 simplified gives 196/27
- So, 84/12 + 21/81 = 196/27
In mixed form: 77/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+42/81 84/24+21/81 84/12+63/81 84/36+21/81 84/60+21/81