We divide 209991 by 20
Let's see how many times 20 fits into 209991.

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
Subtracting 0 from 2 leaves us with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 20

Going ahead to step 2:
20 divided by 20 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 20 away from 20, we end up with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 20

Step 3:
20 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we take 0 away from 9, we end up with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 20

Moving on to step 4:
20 goes into 99 4 times with a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
Subtracting 80 from 99 leaves us with 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 20

Advancing to step 5:
20 can be fit into 199 9 times, resulting in a remainder of 19.
The next digit of our result is 9. 
Result so far: 1049.0
Deduct 180 from 199 and we're left with 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 20

Going ahead to step 6:
191 divided by 20 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 10499.0
Subtract 180 from 191 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
20 goes into 110 5 times with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 10499.5
Subtract 100 from 110 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.
Record the quotient 5 as the next digit in the result. 
Result so far: 10499.55
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 10499.55, and the remainder is 0.0.