We look at the division of 745018 by 18 
The aim is to understand the frequency of 18 in 745018.

Step 1:
When dividing 7 by 18, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 18

Advancing to step 2:
74 divided by 18 is 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 2 after subtracting 72 from 74.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 18

Step 3:
The number 18 fits into 25 1 times, leaving a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
If we subtract 18 from 25, we get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 18

Moving on to step 4:
When dividing 70 by 18, we get 3 with a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 413.0
If we take 54 away from 70, we end up with 16.
Grab the next digit (1) from the dividend, add it to 16, then carry on: 161 / 18

Going ahead to step 5:
When dividing 161 by 18, we get 8 with a remainder of 17.
Write down 8 as next digit of the result. 
Result so far: 4138.0
Deduct 144 from 161 and we're left with 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 18

Let's proceed to step 6:
18 can be fit into 178 9 times, resulting in a remainder of 16.
Use 9 as the next digit of our solution. 
Result so far: 41389.0
Subtract 162 from 178 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 7:
18 goes into 160 8 times with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 41389.8
Subtracting 144 from 160 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 8:
160 divided by 18 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 41389.88
If we subtract 144 from 160, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final result is 41389.88 with a remainder of 0.016.