We look at the division of 486893 by 18 
The aim is to understand the frequency of 18 in 486893.

On to step 1:
4 divided by 18 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 18

Step 2:
When dividing 48 by 18, we get 2 with a remainder of 12.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 12 after subtracting 36 from 48.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 18

Advancing to step 3:
If we divide 126 by 18, we get 7 and a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 27.0
If we subtract 126 from 126, we get 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 18

Let's proceed to step 4:
18 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 270.0
If we subtract 0 from 8, we get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 18

Advancing to step 5:
18 can be fit into 89 4 times, resulting in a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 2704.0
Deduct 72 from 89 and we're left with 17.
Bring next digit (3) of the dividend behind the 17 and repeat the process: 173 / 18

Step 6:
The number 18 fits into 173 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 27049.0
Deduct 162 from 173 and we're left 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.

Let's proceed to step 7:
If we divide 110 by 18, we get 6 and a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 27049.6
The remainder is 2 after subtracting 108 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
The number 18 fits into 20 1 times, leaving a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 27049.61
Subtracting 18 from 20 leaves us 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.

Moving on to step 9:
When dividing 20 by 18, we get 1 with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 27049.611
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 final outcome is 27049.611, with a leftover of 0.0002.