We look at the division of 78743 by 18 
The aim is to understand the frequency of 18 in 78743.

Step 1:
If we divide 7 by 18, we get 0 and 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.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 18

On to step 2:
The number 18 fits into 78 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 72 from 78 to get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 18

Advancing to step 3:
18 can be fit into 67 3 times, resulting in a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Deduct 54 from 67 and we're left with 13.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 18

Advancing to step 4:
18 goes into 134 7 times with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 437.0
If we subtract 126 from 134, we get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 18

Moving on to step 5:
The number 18 fits into 83 4 times, leaving a remainder of 11.
The next digit of our result is 4. 
Result so far: 4374.0
If we take 72 away from 83, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 6:
18 can be fit into 110 6 times, resulting in a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 4374.6
Subtract 108 from 110 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
18 can be fit into 20 1 times, resulting in a remainder of 2.
The next digit of our result is 1. 
Result so far: 4374.61
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
If we divide 20 by 18, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 4374.611
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 4374.611, and the remainder is 0.0002.