We're dividing 858001 by 20 
We want to divide 858001 by 20.

On to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 20

Step 2:
85 divided by 20 is 4 with a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 80 from 85 and we're left with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 20

Step 3:
20 can be fit into 58 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtracting 40 from 58 leaves us with 18.
Include the next digit (0) from the dividend after 18, then repeat: 180 / 20

Let's proceed to step 4:
20 goes into 180 9 times with a remainder of 0.
The next digit of our result is 9. 
Result so far: 429.0
If we take 180 away from 180, we end up with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 20

Advancing to step 5:
If we divide 0 by 20, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4290.0
Subtract 0 from 0 to get 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 20

On to step 6:
The number 20 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 42900.0
If we take 0 away from 1, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
The number 20 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 42900.0
If we take 0 away from 10, 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:
100 divided by 20 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 42900.05
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.

Let's proceed 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: 42900.05
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.

Let's proceed to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42900.05
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.

After the division, we end up with 42900.05 and a remainder of 0.0.