We divide 403810 by 12
We want to divide 403810 by 12.

Moving on to step 1:
If we divide 4 by 12, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 12

On to step 2:
The number 12 fits into 40 3 times, leaving a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 4 after subtracting 36 from 40.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 12

Step 3:
The number 12 fits into 43 3 times, leaving a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Deduct 36 from 43 and we're left with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 12

Let's proceed to step 4:
The number 12 fits into 78 6 times, leaving a remainder of 6.
The next digit of our result is 6. 
Result so far: 336.0
Subtract 72 from 78 to get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 12

Going ahead to step 5:
12 can be fit into 61 5 times, resulting in a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 3365.0
Deduct 60 from 61 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 12

On to step 6:
If we divide 10 by 12, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 33650.0
Subtracting 0 from 10 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.

Moving on to step 7:
If we divide 100 by 12, we get 8 and a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 33650.8
Subtracting 96 from 100 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.

Step 8:
12 goes into 40 3 times with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 33650.83
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.

On to step 9:
12 goes into 40 3 times with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 33650.833
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.

The final outcome is 33650.833, with a leftover of 0.0004.