We look at the division of 803648 by 18 
The aim is to understand the frequency of 18 in 803648.

Let's proceed to step 1:
When dividing 8 by 18, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 18

Moving on to step 2:
The number 18 fits into 80 4 times, leaving a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 72 from 80 leaves us with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 18

Moving on to step 3:
83 divided by 18 is 4 with a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 44.0
The remainder is 11 after subtracting 72 from 83.
Take the next digit (6) from the dividend and append it to 11, then repeat: 116 / 18

Advancing to step 4:
18 goes into 116 6 times with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 446.0
If we take 108 away from 116, we end up with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 18

Let's proceed to step 5:
18 can be fit into 84 4 times, resulting in a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 4464.0
Deduct 72 from 84 and we're left with 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 18

Let's proceed to step 6:
128 divided by 18 is 7 with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 44647.0
Deduct 126 from 128 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
20 divided by 18 is 1 with a remainder of 2.
The next digit of our result is 1. 
Result so far: 44647.1
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.

Going ahead to step 8:
When dividing 20 by 18, we get 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 44647.11
Deduct 18 from 20 and we're left with 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 44647.11, and the remainder is 0.002.