We look at the division of 397343 by 12 
We want to figure out the number of times 397343 can be divided by 12.

Advancing to step 1:
When dividing 3 by 12, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 12

On to step 2:
When dividing 39 by 12, we get 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 36 from 39 and we're left with 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 12

On to step 3:
12 goes into 37 3 times with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 33.0
The remainder is 1 after subtracting 36 from 37.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 12

Moving on to step 4:
If we divide 13 by 12, we get 1 and a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 331.0
Deduct 12 from 13 and we're left with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 12

Step 5:
If we divide 14 by 12, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 3311.0
Deduct 12 from 14 and we're left with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 12

On to step 6:
23 divided by 12 is 1 with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 33111.0
Subtracting 12 from 23 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
The number 12 fits into 110 9 times, leaving a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 33111.9
The remainder is 2 after subtracting 108 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
12 goes into 20 1 times with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 33111.91
If we take 12 away from 20, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 9:
12 goes into 80 6 times with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 33111.916
Subtracting 72 from 80 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 33111.9166
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 33111.9166, with a leftover of 8e-05.