Add 20/81 and 40/12
1st number: 20/81, 2nd number: 3 4/12
20/81 + 40/12 is 290/81.
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,
20/81 = 20 × 4/81 × 4 = 80/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
40/12 = 40 × 27/12 × 27 = 1080/324 - Add the two like fractions:
80/324 + 1080/324 = 80 + 1080/324 = 1160/324 - 1160/324 simplified gives 290/81
- So, 20/81 + 40/12 = 290/81
In mixed form: 347/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81+40/12 20/81+80/12 20/81+40/24 60/81+40/12 20/81+40/36 20/81+40/60 20/81+40/84