We look at the division of 126199 by 18 
The aim is to understand the frequency of 18 in 126199.

Going ahead to step 1:
18 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 18

Let's proceed to step 2:
The number 18 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Grab the next digit (6) from the dividend, add it to 12, then carry on: 126 / 18

Step 3:
When dividing 126 by 18, we get 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 126 from 126 and we're left with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 18

Going ahead to step 4:
When dividing 1 by 18, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 70.0
If we take 0 away from 1, we end up with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 18

Advancing to step 5:
The number 18 fits into 19 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 701.0
If we subtract 18 from 19, we get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 18

On to step 6:
When dividing 19 by 18, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 7011.0
Deduct 18 from 19 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
10 divided by 18 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 7011.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
The number 18 fits into 100 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 7011.05
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.

Moving on to step 9:
100 divided by 18 is 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 7011.055
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.

The final result is 7011.055 with a remainder of 0.001.