We're dividing 819773 by 18 
The aim is to understand the frequency of 18 in 819773.

On to step 1:
The number 18 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 18

Let's proceed to step 2:
81 divided by 18 is 4 with a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 72 away from 81, we end up with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 18

Advancing to step 3:
99 divided by 18 is 5 with a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we subtract 90 from 99, we get 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 18

Going ahead to step 4:
When dividing 97 by 18, we get 5 with a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 455.0
Deduct 90 from 97 and we're left with 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 18

On to step 5:
If we divide 77 by 18, we get 4 and a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 4554.0
The remainder is 5 after subtracting 72 from 77.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 18

Going ahead to step 6:
18 goes into 53 2 times with a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 45542.0
If we subtract 36 from 53, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 7:
When dividing 170 by 18, we get 9 with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 45542.9
Subtracting 162 from 170 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
80 divided by 18 is 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 45542.94
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
18 goes into 80 4 times with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 45542.944
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 45542.944, with a leftover of 0.0008.