We look at the division of 438643 by 5 
We want to figure out the number of times 438643 can be divided by 5.

Let's proceed to step 1:
4 divided by 5 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 5

Step 2:
If we divide 43 by 5, we get 8 and a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 40 from 43 to get 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 5

Step 3:
5 goes into 38 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
Deduct 35 from 38 and we're left with 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 5

Advancing to step 4:
36 divided by 5 is 7 with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 877.0
The remainder is 1 after subtracting 35 from 36.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 5

Step 5:
5 goes into 14 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 8772.0
Deduct 10 from 14 and we're left with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 5

On to step 6:
5 goes into 43 8 times with a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 87728.0
If we take 40 away from 43, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
When dividing 30 by 5, we get 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 87728.6
If we subtract 30 from 30, 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 8:
5 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 87728.6
Subtract 0 from 0 to 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.

Moving on to step 9:
0 divided by 5 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 87728.6
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.

Our division results in 87728.6 with a remaining 0.0.