We divide 10991 by 20
Let's see how many times 20 fits into 10991.

Let's proceed to step 1:
When dividing 1 by 20, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 20

Let's proceed to step 2:
The number 20 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (9) from the dividend and append it to 10, then repeat: 109 / 20

Step 3:
If we divide 109 by 20, we get 5 and a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
The remainder is 9 after subtracting 100 from 109.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 20

Going ahead to step 4:
When dividing 99 by 20, we get 4 with a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 54.0
If we subtract 80 from 99, we get 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 20

Let's proceed to step 5:
The number 20 fits into 191 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 549.0
If we subtract 180 from 191, we 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.

Let's proceed to step 6:
When dividing 110 by 20, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 549.5
The remainder is 10 after subtracting 100 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
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: 549.55
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.

Our division results in 549.55 with a remaining 0.0.