We divide 91188145 by 20
We want to figure out the number of times 91188145 can be divided by 20.

On to step 1:
If we divide 9 by 20, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 20

Let's proceed to step 2:
20 goes into 91 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 80 from 91 leaves us with 11.
Bring next digit (1) of the dividend behind the 11 and repeat the process: 111 / 20

Step 3:
If we divide 111 by 20, we get 5 and a remainder of 11.
The next digit of our result is 5. 
Result so far: 45.0
Deduct 100 from 111 and we're left with 11.
Bring next digit (8) of the dividend behind the 11 and repeat the process: 118 / 20

Let's proceed to step 4:
If we divide 118 by 20, we get 5 and a remainder of 18.
The next digit of our result is 5. 
Result so far: 455.0
The remainder is 18 after subtracting 100 from 118.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 20

Advancing to step 5:
If we divide 188 by 20, we get 9 and a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 4559.0
Deduct 180 from 188 and we're left with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 20

Advancing to step 6:
When dividing 81 by 20, we get 4 with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 45594.0
If we take 80 away from 81, we end up with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 20

Let's proceed to step 7:
If we divide 14 by 20, we get 0 and a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 455940.0
If we subtract 0 from 14, we get 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 20

Going ahead to step 8:
20 goes into 145 7 times with a remainder of 5.
Record the quotient 7 as the next digit in the result. 
Result so far: 4559407.0
Subtracting 140 from 145 leaves us 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.

On to step 9:
20 can be fit into 50 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 4559407.2
Deduct 40 from 50 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.

Step 10:
When dividing 100 by 20, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4559407.25
Deduct 100 from 100 and we're left 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 11:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4559407.25
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.

Step 12:
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: 4559407.25
Deduct 0 from 0 and we're left 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.

The final outcome is 4559407.25, with a leftover of 0.0.