We look at the division of 439561 by 12 
Our goal is to divide 439561 by 12.

Step 1:
When dividing 4 by 12, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 12

Advancing to step 2:
The number 12 fits into 43 3 times, leaving a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 36 from 43 leaves us with 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 12

Let's proceed to step 3:
The number 12 fits into 79 6 times, leaving a remainder of 7.
The next digit of our result is 6. 
Result so far: 36.0
Subtracting 72 from 79 leaves us with 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 12

Moving on to step 4:
75 divided by 12 is 6 with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 366.0
The remainder is 3 after subtracting 72 from 75.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 12

Moving on to step 5:
The number 12 fits into 36 3 times, leaving a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3663.0
The remainder is 0 after subtracting 36 from 36.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 12

On to step 6:
The number 12 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 36630.0
Subtracting 0 from 1 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
If we divide 10 by 12, we get 0 and a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 36630.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
12 can be fit into 100 8 times, resulting in a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 36630.08
Subtract 96 from 100 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.

Going ahead to step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 36630.083
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.

Let's proceed to step 10:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 36630.0833
Deduct 36 from 40 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.

After the division, we end up with 36630.0833 and a remainder of 4e-05.