We look at the division of 611508 by 18 
The aim is to understand the frequency of 18 in 611508.

Let's proceed to step 1:
6 divided by 18 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 18

Step 2:
The number 18 fits into 61 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 54 away from 61, we end up with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 18

On to step 3:
The number 18 fits into 71 3 times, leaving a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 33.0
The remainder is 17 after subtracting 54 from 71.
Bring next digit (5) of the dividend behind the 17 and repeat the process: 175 / 18

Let's proceed to step 4:
18 goes into 175 9 times with a remainder of 13.
Use 9 as the next digit of our solution. 
Result so far: 339.0
Deduct 162 from 175 and we're left with 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 18

Going ahead to step 5:
18 can be fit into 130 7 times, resulting in a remainder of 4.
The next digit of our result is 7. 
Result so far: 3397.0
Subtract 126 from 130 to get 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 18

Step 6:
When dividing 48 by 18, we get 2 with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 33972.0
Deduct 36 from 48 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
120 divided by 18 is 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 33972.6
Subtract 108 from 120 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
The number 18 fits into 120 6 times, leaving a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 33972.66
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 33972.66 and a remainder of 0.012.