We divide 640843 by 4
We want to figure out the number of times 640843 can be divided by 4.

Advancing to step 1:
6 divided by 4 is 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 4 from 6 and we're left with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 4

Going ahead to step 2:
24 divided by 4 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we subtract 24 from 24, we get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 4

Advancing to step 3:
The number 4 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 160.0
Subtracting 0 from 0 leaves us with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 4

Advancing to step 4:
4 can be fit into 8 2 times, resulting in a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 1602.0
Deduct 8 from 8 and we're left with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 4

Going ahead to step 5:
4 divided by 4 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 16021.0
Subtract 4 from 4 to get 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 4

Going ahead to step 6:
4 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 160210.0
Subtract 0 from 3 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
The number 4 fits into 30 7 times, leaving a remainder of 2.
The next digit of our result is 7. 
Result so far: 160210.7
If we take 28 away from 30, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
20 divided by 4 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 160210.75
Subtract 20 from 20 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.

Going ahead to step 9:
0 divided by 4 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 160210.75
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
4 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 160210.75
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 160210.75 with a balance of 0.0.