We're dividing 643128 by 18 
We want to divide 643128 by 18.

On to step 1:
18 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 18

Advancing to step 2:
The number 18 fits into 64 3 times, leaving a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 54 away from 64, we end up with 10.
Append the next digit (3) from the dividend to 10 and continue with: 103 / 18

Going ahead to step 3:
If we divide 103 by 18, we get 5 and a remainder of 13.
Put 5 as the next digit of the answer. 
Result so far: 35.0
If we subtract 90 from 103, we get 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 18

Advancing to step 4:
131 divided by 18 is 7 with a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 357.0
The remainder is 5 after subtracting 126 from 131.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 18

Advancing to step 5:
18 goes into 52 2 times with a remainder of 16.
Write down 2 as next digit of the result. 
Result so far: 3572.0
The remainder is 16 after subtracting 36 from 52.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 18

Moving on to step 6:
18 can be fit into 168 9 times, resulting in a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 35729.0
If we take 162 away from 168, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
18 can be fit into 60 3 times, resulting in a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 35729.3
If we subtract 54 from 60, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
18 goes into 60 3 times with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 35729.33
The remainder is 6 after subtracting 54 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Our division results in 35729.33 with a remaining 0.006.