Add 21/12 and 4/81
1st number: 1 9/12, 2nd number: 4/81
21/12 + 4/81 is 583/324.
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,
21/12 = 21 × 27/12 × 27 = 567/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
4/81 = 4 × 4/81 × 4 = 16/324 - Add the two like fractions:
567/324 + 16/324 = 567 + 16/324 = 583/324 - So, 21/12 + 4/81 = 583/324
In mixed form: 1259/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+4/81 21/12+8/81 21/24+4/81 63/12+4/81 21/12+12/81 21/36+4/81 21/12+20/81 21/60+4/81 21/12+28/81 21/84+4/81