We divide 91580 by 45
The aim is to understand the frequency of 45 in 91580.

Step 1:
9 divided by 45 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 45

On to step 2:
When dividing 91 by 45, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 90 from 91, we get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 45

Advancing to step 3:
45 can be fit into 15 0 times, resulting in a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we take 0 away from 15, we end up with 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 45

Advancing to step 4:
158 divided by 45 is 3 with a remainder of 23.
The next digit of our result is 3. 
Result so far: 203.0
The remainder is 23 after subtracting 135 from 158.
Take the next digit (0) from the dividend and append it to 23, then repeat: 230 / 45

Advancing to step 5:
The number 45 fits into 230 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 2035.0
If we take 225 away from 230, 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.

Going ahead to step 6:
45 goes into 50 1 times with a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 2035.1
If we take 45 away from 50, 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.

Let's proceed to step 7:
When dividing 50 by 45, we get 1 with a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 2035.11
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 2035.11 with a remainder of 0.005.