Let's divide 91121485 by 20
We want to figure out the number of times 91121485 can be divided by 20.

On to step 1:
9 divided by 20 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 20

Let's proceed to step 2:
20 goes into 91 4 times with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 80 from 91 and we're left with 11.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 20

Advancing to step 3:
When dividing 111 by 20, we get 5 with a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we subtract 100 from 111, we get 11.
Append the next digit (2) from the dividend to 11 and continue with: 112 / 20

Going ahead to step 4:
The number 20 fits into 112 5 times, leaving a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 455.0
Subtracting 100 from 112 leaves us with 12.
Fetch the next digit (1) from the dividend, attach it to 12 and continue: 121 / 20

Step 5:
20 can be fit into 121 6 times, resulting in a remainder of 1.
The next digit of our result is 6. 
Result so far: 4556.0
Deduct 120 from 121 and we're left with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 20

On to step 6:
When dividing 14 by 20, we get 0 with a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 45560.0
The remainder is 14 after subtracting 0 from 14.
Bring next digit (8) of the dividend behind the 14 and repeat the process: 148 / 20

Step 7:
20 goes into 148 7 times with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 455607.0
Subtract 140 from 148 to get 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 20

Step 8:
85 divided by 20 is 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 4556074.0
If we take 80 away from 85, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
When dividing 50 by 20, we get 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 4556074.2
The remainder is 10 after subtracting 40 from 50.
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 10:
If we divide 100 by 20, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 4556074.25
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.

Let's proceed to step 11:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4556074.25
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.

Step 12:
When dividing 0 by 20, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4556074.25
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.

Our division results in 4556074.25 with a remaining 0.0.