We divide 490481 by 18
The aim is to understand the frequency of 18 in 490481.

Let's proceed to step 1:
If we divide 4 by 18, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 18

Advancing to step 2:
18 can be fit into 49 2 times, resulting in a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 13 after subtracting 36 from 49.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 18

Moving on to step 3:
130 divided by 18 is 7 with a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 27.0
If we take 126 away from 130, we end up with 4.
Include the next digit (4) from the dividend after 4, then repeat: 44 / 18

On to step 4:
The number 18 fits into 44 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 272.0
If we take 36 away from 44, we end up with 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 18

Moving on to step 5:
18 goes into 88 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 2724.0
Subtracting 72 from 88 leaves us with 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 18

On to step 6:
The number 18 fits into 161 8 times, leaving a remainder of 17.
Record the quotient 8 as the next digit in the result. 
Result so far: 27248.0
If we take 144 away from 161, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 7:
18 can be fit into 170 9 times, resulting in a remainder of 8.
The next digit of our result is 9. 
Result so far: 27248.9
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.
Use 4 as the next digit of our solution. 
Result so far: 27248.94
If we take 72 away from 80, we end up 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.

Moving on to step 9:
80 divided by 18 is 4 with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 27248.944
Subtracting 72 from 80 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.

After the division, we end up with 27248.944 and a remainder of 0.0008.