Let's divide 405020 by 12
We want to figure out the number of times 405020 can be divided by 12.

Advancing to step 1:
When dividing 4 by 12, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 12

On to step 2:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 4 after subtracting 36 from 40.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 12

Moving on to step 3:
If we divide 45 by 12, we get 3 and a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 33.0
Subtracting 36 from 45 leaves us with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 12

Moving on to step 4:
90 divided by 12 is 7 with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 337.0
The remainder is 6 after subtracting 84 from 90.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 12

Going ahead to step 5:
62 divided by 12 is 5 with a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 3375.0
If we subtract 60 from 62, we get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 12

On to step 6:
12 goes into 20 1 times with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 33751.0
Deduct 12 from 20 and we're left 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.

Moving on to step 7:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 33751.6
Subtract 72 from 80 to 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.

Step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 33751.66
Deduct 72 from 80 and we're left 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.

In conclusion, the division gives 33751.66 with a balance of 0.008.