We look at the division of 645439 by 20 
Our goal is to divide 645439 by 20.

On to step 1:
When dividing 6 by 20, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 20

Let's proceed to step 2:
When dividing 64 by 20, we get 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 4 after subtracting 60 from 64.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 20

Going ahead to step 3:
45 divided by 20 is 2 with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
If we take 40 away from 45, we end up with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 20

Moving on to step 4:
The number 20 fits into 54 2 times, leaving a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 322.0
If we take 40 away from 54, we end up with 14.
Take the next digit (3) from the dividend and append it to 14, then repeat: 143 / 20

Let's proceed to step 5:
143 divided by 20 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 3227.0
The remainder is 3 after subtracting 140 from 143.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Let's proceed to step 6:
39 divided by 20 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 32271.0
If we subtract 20 from 39, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 7:
190 divided by 20 is 9 with a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 32271.9
Deduct 180 from 190 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
The number 20 fits into 100 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 32271.95
Subtracting 100 from 100 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.

On to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 32271.95
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 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 32271.95
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.

After the division, we end up with 32271.95 and a remainder of 0.0.