817738 ÷ 45 
The aim is to understand the frequency of 45 in 817738.

Advancing to step 1:
8 divided by 45 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 45

Let's proceed to step 2:
81 divided by 45 is 1 with a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 45 from 81 and we're left with 36.
Grab the next digit (7) from the dividend, add it to 36, then carry on: 367 / 45

Step 3:
When dividing 367 by 45, we get 8 with a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Subtract 360 from 367 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 45

On to step 4:
45 goes into 77 1 times with a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 181.0
Subtracting 45 from 77 leaves us with 32.
Grab the next digit (3) from the dividend, add it to 32, then carry on: 323 / 45

Going ahead to step 5:
When dividing 323 by 45, we get 7 with a remainder of 8.
Use 7 as the next digit of our solution. 
Result so far: 1817.0
Deduct 315 from 323 and we're left with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 45

Moving on to step 6:
If we divide 88 by 45, we get 1 and a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 18171.0
Subtracting 45 from 88 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
The number 45 fits into 430 9 times, leaving a remainder of 25.
Put 9 as the next digit of the answer. 
Result so far: 18171.9
Subtract 405 from 430 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 8:
The number 45 fits into 250 5 times, leaving a remainder of 25.
The next digit of our result is 5. 
Result so far: 18171.95
If we subtract 225 from 250, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 9:
45 goes into 250 5 times with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 18171.955
If we take 225 away from 250, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

After the division, we end up with 18171.955 and a remainder of 0.0025.