81843 ÷ 20 
Let's see how many times 20 fits into 81843.

Step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 20

Moving on to step 2:
20 can be fit into 81 4 times, resulting in a remainder of 1.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 80 from 81 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 20

Advancing to step 3:
The number 20 fits into 18 0 times, leaving a remainder of 18.
The next digit of our result is 0. 
Result so far: 40.0
If we subtract 0 from 18, we get 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 20

Advancing to step 4:
When dividing 184 by 20, we get 9 with a remainder of 4.
The next digit of our result is 9. 
Result so far: 409.0
Subtract 180 from 184 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 20

On to step 5:
20 can be fit into 43 2 times, resulting in a remainder of 3.
The next digit of our result is 2. 
Result so far: 4092.0
Deduct 40 from 43 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 6:
The number 20 fits into 30 1 times, leaving a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 4092.1
Deduct 20 from 30 and we're left 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.

Let's proceed to step 7:
20 goes into 100 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4092.15
If we subtract 100 from 100, 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.

Moving on to step 8:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4092.15
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.

Going ahead to step 9:
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: 4092.15
The remainder is 0 after subtracting 0 from 0.
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 4092.15 with a remaining 0.0.