We look at the division of 486609 by 45 
The aim is to understand the frequency of 45 in 486609.

Moving on to step 1:
45 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 45

Advancing to step 2:
45 goes into 48 1 times with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 45 from 48 to get 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 45

Advancing to step 3:
If we divide 36 by 45, we get 0 and a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 36 after subtracting 0 from 36.
Append the next digit (6) from the dividend to 36 and continue with: 366 / 45

Advancing to step 4:
366 divided by 45 is 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 108.0
If we take 360 away from 366, we end up with 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 45

Moving on to step 5:
When dividing 60 by 45, we get 1 with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 1081.0
If we subtract 45 from 60, we get 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 45

Moving on to step 6:
45 can be fit into 159 3 times, resulting in a remainder of 24.
The number 3 becomes the next digit in our result. 
Result so far: 10813.0
Subtracting 135 from 159 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 7:
45 goes into 240 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 10813.5
If we take 225 away from 240, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
45 can be fit into 150 3 times, resulting in a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 10813.53
Subtracting 135 from 150 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 9:
45 goes into 150 3 times with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 10813.533
Subtract 135 from 150 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 10813.533 with a remainder of 0.0015.