Let's divide 420512 by 5
We're looking to find how many times 5 goes into 420512.

On to step 1:
When dividing 4 by 5, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 5

Going ahead to step 2:
5 goes into 42 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 8.0
Subtract 40 from 42 to get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 5

Moving on to step 3:
5 goes into 20 4 times with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 84.0
If we take 20 away from 20, we end up with 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 5

Going ahead to step 4:
If we divide 5 by 5, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 841.0
Deduct 5 from 5 and we're left with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 5

Advancing to step 5:
When dividing 1 by 5, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 8410.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 5

Step 6:
5 can be fit into 12 2 times, resulting in a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 84102.0
If we subtract 10 from 12, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
When dividing 20 by 5, we get 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 84102.4
The remainder is 0 after subtracting 20 from 20.
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 8:
5 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 84102.4
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 9:
0 divided by 5 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 84102.4
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.

The final result is 84102.4 with a remainder of 0.0.