We're dividing 817424 by 45 
The aim is to understand the frequency of 45 in 817424.

Step 1:
45 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 45

Advancing to step 2:
45 goes into 81 1 times with a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 45 from 81, we get 36.
Take the next digit (7) from the dividend and append it to 36, then repeat: 367 / 45

Let's proceed to step 3:
If we divide 367 by 45, we get 8 and a remainder of 7.
Put 8 as the next digit of the answer. 
Result so far: 18.0
Deduct 360 from 367 and we're left with 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 45

Advancing to step 4:
45 goes into 74 1 times with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 181.0
Subtracting 45 from 74 leaves us with 29.
Grab the next digit (2) from the dividend, add it to 29, then carry on: 292 / 45

On to step 5:
When dividing 292 by 45, we get 6 with a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 1816.0
Subtracting 270 from 292 leaves us with 22.
Include the next digit (4) from the dividend after 22, then repeat: 224 / 45

Moving on to step 6:
45 can be fit into 224 4 times, resulting in a remainder of 44.
The next digit of our result is 4. 
Result so far: 18164.0
The remainder is 44 after subtracting 180 from 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 7:
If we divide 440 by 45, we get 9 and a remainder of 35.
Record the quotient 9 as the next digit in the result. 
Result so far: 18164.9
Subtract 405 from 440 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 8:
When dividing 350 by 45, we get 7 with a remainder of 35.
Put 7 as the next digit of the answer. 
Result so far: 18164.97
Subtract 315 from 350 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 9:
If we divide 350 by 45, we get 7 and a remainder of 35.
Put 7 as the next digit of the answer. 
Result so far: 18164.977
If we take 315 away from 350, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 18164.977, with a leftover of 0.0035.