We're dividing 485145 by 20 
Let's see how many times 20 fits into 485145.

Advancing to step 1:
20 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 20

On to step 2:
When dividing 48 by 20, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 40 away from 48, we end up with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 20

Moving on to step 3:
When dividing 85 by 20, we get 4 with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Deduct 80 from 85 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 20

Let's proceed to step 4:
51 divided by 20 is 2 with a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 242.0
If we take 40 away from 51, we end up with 11.
Append the next digit (4) from the dividend to 11 and continue with: 114 / 20

Going ahead to step 5:
If we divide 114 by 20, we get 5 and a remainder of 14.
The number 5 becomes the next digit in our result. 
Result so far: 2425.0
If we take 100 away from 114, we end up with 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 20

Moving on to step 6:
20 goes into 145 7 times with a remainder of 5.
The next digit of our result is 7. 
Result so far: 24257.0
If we subtract 140 from 145, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
If we divide 50 by 20, we get 2 and a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 24257.2
Subtract 40 from 50 to 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:
When dividing 100 by 20, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 24257.25
If we take 100 away from 100, we end up 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.
Record the quotient 0 as the next digit in the result. 
Result so far: 24257.25
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.

Step 10:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 24257.25
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.

The final outcome is 24257.25, with a leftover of 0.0.