We look at the division of 8400 by 20 
We're looking to find how many times 20 goes into 8400.

Going ahead to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 20

Step 2:
If we divide 84 by 20, we get 4 and a remainder of 4.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 4 after subtracting 80 from 84.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 20

Advancing to step 3:
The number 20 fits into 40 2 times, leaving a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Deduct 40 from 40 and we're left with 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 20

Going ahead to step 4:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 420.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 5:
If we divide 0 by 20, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 420.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 6:
0 divided by 20 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 420.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 420.0, and the remainder is 0.0.