843057 ÷ 20 
Our goal is to divide 843057 by 20.

Let's proceed to step 1:
If we divide 8 by 20, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 20

Advancing to step 2:
If we divide 84 by 20, we get 4 and a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 80 from 84 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

Step 3:
When dividing 43 by 20, we get 2 with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
Subtract 40 from 43 to get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 20

Advancing to step 4:
If we divide 30 by 20, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 421.0
Deduct 20 from 30 and we're left with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 20

On to step 5:
105 divided by 20 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 4215.0
Deduct 100 from 105 and we're left with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 20

On to step 6:
The number 20 fits into 57 2 times, leaving a remainder of 17.
Put 2 as the next digit of the answer. 
Result so far: 42152.0
Subtract 40 from 57 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 7:
20 goes into 170 8 times with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 42152.8
Subtract 160 from 170 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:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 42152.85
Subtract 100 from 100 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 9:
20 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 42152.85
If we take 0 away from 0, 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 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 42152.85
If we take 0 away from 0, 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.

After the division, we end up with 42152.85 and a remainder of 0.0.