We're dividing 437809 by 12 
We're looking to find how many times 12 goes into 437809.

Going ahead to step 1:
12 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 12

Going ahead to step 2:
The number 12 fits into 43 3 times, leaving a remainder of 7.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 36 from 43, we get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 12

Advancing to step 3:
12 goes into 77 6 times with a remainder of 5.
Use 6 as the next digit of our solution. 
Result so far: 36.0
The remainder is 5 after subtracting 72 from 77.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 12

Moving on to step 4:
The number 12 fits into 58 4 times, leaving a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 364.0
Deduct 48 from 58 and we're left with 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 12

Advancing to step 5:
When dividing 100 by 12, we get 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 3648.0
Deduct 96 from 100 and we're left with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 12

Moving on to step 6:
12 can be fit into 49 4 times, resulting in a remainder of 1.
The next digit of our result is 4. 
Result so far: 36484.0
If we take 48 away from 49, we end up 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.

Going ahead to step 7:
12 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 36484.0
Deduct 0 from 10 and we're left 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.

Moving on to step 8:
The number 12 fits into 100 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 36484.08
If we take 96 away from 100, 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.

Moving on to step 9:
40 divided by 12 is 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 36484.083
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.

Moving on to step 10:
40 divided by 12 is 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 36484.0833
Subtracting 36 from 40 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.

The final outcome is 36484.0833, with a leftover of 4e-05.