We look at the division of 517996 by 12 
Our goal is to divide 517996 by 12.

Step 1:
12 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 12

On to step 2:
The number 12 fits into 51 4 times, leaving a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 48 from 51 to get 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 12

Step 3:
37 divided by 12 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Deduct 36 from 37 and we're left with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 12

Let's proceed to step 4:
12 goes into 19 1 times with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 431.0
The remainder is 7 after subtracting 12 from 19.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 12

Let's proceed to step 5:
If we divide 79 by 12, we get 6 and a remainder of 7.
Record the quotient 6 as the next digit in the result. 
Result so far: 4316.0
Subtracting 72 from 79 leaves us with 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 12

Going ahead to step 6:
12 goes into 76 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 43166.0
Subtracting 72 from 76 leaves us 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.

Going ahead to step 7:
When dividing 40 by 12, we get 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 43166.3
If we subtract 36 from 40, we 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.

Step 8:
12 goes into 40 3 times with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 43166.33
The remainder is 4 after subtracting 36 from 40.
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 43166.33, with a leftover of 0.004.