243681 divided by 18 
The aim is to understand the frequency of 18 in 243681.

Let's proceed to step 1:
18 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 18

On to step 2:
When dividing 24 by 18, we get 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 18 from 24, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 18

Let's proceed to step 3:
63 divided by 18 is 3 with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtract 54 from 63 to get 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 18

Moving on to step 4:
18 goes into 96 5 times with a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 135.0
If we take 90 away from 96, we end up with 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 18

Going ahead to step 5:
68 divided by 18 is 3 with a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 1353.0
Subtract 54 from 68 to get 14.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 18

On to step 6:
The number 18 fits into 141 7 times, leaving a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 13537.0
The remainder is 15 after subtracting 126 from 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
If we divide 150 by 18, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 13537.8
If we take 144 away from 150, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
If we divide 60 by 18, we get 3 and a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 13537.83
If we take 54 away from 60, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
18 can be fit into 60 3 times, resulting in a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 13537.833
Subtracting 54 from 60 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 13537.833 and a remainder of 0.0006.