We're dividing 243859 by 20 
We want to divide 243859 by 20.

On to step 1:
If we divide 2 by 20, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 20

Let's proceed to step 2:
If we divide 24 by 20, we get 1 and a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 20 from 24, we get 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 20

Moving on to step 3:
20 can be fit into 43 2 times, resulting in a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 40 from 43, we get 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 20

Step 4:
If we divide 38 by 20, we get 1 and a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 121.0
Subtract 20 from 38 to get 18.
Append the next digit (5) from the dividend to 18 and continue with: 185 / 20

Let's proceed to step 5:
The number 20 fits into 185 9 times, leaving a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 1219.0
If we subtract 180 from 185, we get 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 20

On to step 6:
20 can be fit into 59 2 times, resulting in a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 12192.0
Subtracting 40 from 59 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 7:
The number 20 fits into 190 9 times, leaving a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 12192.9
If we subtract 180 from 190, we 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.

On to step 8:
20 goes into 100 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 12192.95
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.

Going ahead to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12192.95
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.

Let's proceed to step 10:
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: 12192.95
Subtracting 0 from 0 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.

After the division, we end up with 12192.95 and a remainder of 0.0.