We look at the division of 643918 by 4 
Let's see how many times 4 fits into 643918.

Going ahead to step 1:
4 can be fit into 6 1 times, resulting in a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 4 away from 6, we end up with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 4

Going ahead to step 2:
24 divided by 4 is 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Subtracting 24 from 24 leaves us with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 4

Moving on to step 3:
3 divided by 4 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 160.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 4

Going ahead to step 4:
The number 4 fits into 39 9 times, leaving a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 1609.0
Deduct 36 from 39 and we're left with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 4

Step 5:
If we divide 31 by 4, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 16097.0
Subtract 28 from 31 to get 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 4

Going ahead to step 6:
38 divided by 4 is 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 160979.0
Subtract 36 from 38 to 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.

Step 7:
If we divide 20 by 4, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 160979.5
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.

Step 8:
4 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 160979.5
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.

Let's proceed to step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 160979.5
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.

After the division, we end up with 160979.5 and a remainder of 0.0.