We're dividing 252171 by 20 
We want to figure out the number of times 252171 can be divided by 20.

Let's proceed to step 1:
If we divide 2 by 20, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 20

Moving on to step 2:
If we divide 25 by 20, we get 1 and a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 20 from 25 and we're left with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 20

Step 3:
If we divide 52 by 20, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 12.0
If we take 40 away from 52, we end up with 12.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 20

Going ahead to step 4:
When dividing 121 by 20, we get 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 126.0
The remainder is 1 after subtracting 120 from 121.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 20

Going ahead to step 5:
If we divide 17 by 20, we get 0 and a remainder of 17.
Record the quotient 0 as the next digit in the result. 
Result so far: 1260.0
If we subtract 0 from 17, we get 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 20

Advancing to step 6:
If we divide 171 by 20, we get 8 and a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 12608.0
Subtract 160 from 171 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 7:
20 goes into 110 5 times with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 12608.5
If we subtract 100 from 110, we get 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.
The number 5 becomes the next digit in our result. 
Result so far: 12608.55
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 12608.55 with a remaining 0.0.