645225 ÷ 20 
We want to divide 645225 by 20.

On to step 1:
The number 20 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 20

Step 2:
The number 20 fits into 64 3 times, leaving a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 60 away from 64, we end up with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 20

Let's proceed to step 3:
20 can be fit into 45 2 times, resulting in a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
The remainder is 5 after subtracting 40 from 45.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 20

On to step 4:
20 can be fit into 52 2 times, resulting in a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 322.0
Subtract 40 from 52 to get 12.
Include the next digit (2) from the dividend after 12, then repeat: 122 / 20

On to step 5:
If we divide 122 by 20, we get 6 and a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 3226.0
If we subtract 120 from 122, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 20

Let's proceed to step 6:
When dividing 25 by 20, we get 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 32261.0
The remainder is 5 after subtracting 20 from 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
The number 20 fits into 50 2 times, leaving a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 32261.2
If we take 40 away from 50, we end up 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.

Step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 32261.25
Deduct 100 from 100 and we're left 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 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 32261.25
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.

Moving on to step 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 32261.25
Deduct 0 from 0 and we're left 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.

The quotient of the division is 32261.25, and the remainder is 0.0.