We look at the division of 850009 by 20 
We want to divide 850009 by 20.

Step 1:
20 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 20

Advancing to step 2:
If we divide 85 by 20, we get 4 and a remainder of 5.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 80 from 85 to get 5.
Include the next digit (0) from the dividend after 5, then repeat: 50 / 20

Moving on to step 3:
When dividing 50 by 20, we get 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Subtract 40 from 50 to get 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 20

Moving on to step 4:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 425.0
The remainder is 0 after subtracting 100 from 100.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 20

Let's proceed to step 5:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4250.0
Subtracting 0 from 0 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 20

Going ahead to step 6:
20 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 42500.0
Subtract 0 from 9 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
When dividing 90 by 20, we get 4 with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 42500.4
Subtract 80 from 90 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.

Advancing to step 8:
20 goes into 100 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 42500.45
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.

Going ahead to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42500.45
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.

Let's proceed to step 10:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42500.45
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.

The final outcome is 42500.45, with a leftover of 0.0.