535816 ÷ 18 
The aim is to understand the frequency of 18 in 535816.

On to step 1:
When dividing 5 by 18, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 18

Let's proceed to step 2:
18 can be fit into 53 2 times, resulting in a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 36 away from 53, we end up with 17.
Fetch the next digit (5) from the dividend, attach it to 17 and continue: 175 / 18

Moving on to step 3:
175 divided by 18 is 9 with a remainder of 13.
The next digit of our result is 9. 
Result so far: 29.0
Subtracting 162 from 175 leaves us with 13.
Include the next digit (8) from the dividend after 13, then repeat: 138 / 18

Step 4:
If we divide 138 by 18, we get 7 and a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 297.0
If we subtract 126 from 138, we get 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 18

Step 5:
18 goes into 121 6 times with a remainder of 13.
Write down 6 as next digit of the result. 
Result so far: 2976.0
Subtract 108 from 121 to get 13.
Include the next digit (6) from the dividend after 13, then repeat: 136 / 18

Moving on to step 6:
18 goes into 136 7 times with a remainder of 10.
The next digit of our result is 7. 
Result so far: 29767.0
Subtracting 126 from 136 leaves us 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.

On to step 7:
18 goes into 100 5 times with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 29767.5
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
When dividing 100 by 18, we get 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 29767.55
Deduct 90 from 100 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.

The final result is 29767.55 with a remainder of 0.01.