We divide 640820 by 4
We want to divide 640820 by 4.

Moving on to step 1:
4 goes into 6 1 times with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 4

Let's proceed to step 2:
4 can be fit into 24 6 times, resulting in a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 16.0
The remainder is 0 after subtracting 24 from 24.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 4

On to step 3:
If we divide 0 by 4, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 160.0
Deduct 0 from 0 and we're left with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 4

Moving on to step 4:
If we divide 8 by 4, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 1602.0
Subtract 8 from 8 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 4

On to step 5:
4 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 16020.0
Subtract 0 from 2 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 4

Going ahead to step 6:
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: 160205.0
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 7:
0 divided by 4 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 160205.0
If we subtract 0 from 0, 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.

On to 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: 160205.0
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.

The final result is 160205.0 with a remainder of 0.0.