843994 divided by 12 
We're looking to find how many times 12 goes into 843994.

Going ahead to step 1:
When dividing 8 by 12, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 12

Step 2:
When dividing 84 by 12, we get 7 with a remainder of 0.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 84 from 84 and we're left with 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 12

Step 3:
The number 12 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 70.0
If we take 0 away from 3, we end up with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 12

Moving on to step 4:
The number 12 fits into 39 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 703.0
If we take 36 away from 39, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 12

Moving on to step 5:
The number 12 fits into 39 3 times, leaving a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 7033.0
The remainder is 3 after subtracting 36 from 39.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 12

Going ahead to step 6:
The number 12 fits into 34 2 times, leaving a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 70332.0
Subtracting 24 from 34 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
The number 12 fits into 100 8 times, leaving a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 70332.8
Deduct 96 from 100 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 8:
40 divided by 12 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 70332.83
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 70332.833
Subtract 36 from 40 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 70332.833, with a leftover of 0.0004.