We're dividing 493407 by 18 
The aim is to understand the frequency of 18 in 493407.

Going ahead 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
Deduct 0 from 4 and we're left with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 18

Advancing to step 2:
The number 18 fits into 49 2 times, leaving a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 36 from 49, we get 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 18

Moving on to step 3:
When dividing 133 by 18, we get 7 with a remainder of 7.
The next digit of our result is 7. 
Result so far: 27.0
Subtracting 126 from 133 leaves us with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 18

Step 4:
18 goes into 74 4 times with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 274.0
Subtract 72 from 74 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 18

Let's proceed to step 5:
20 divided by 18 is 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 2741.0
The remainder is 2 after subtracting 18 from 20.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 18

On to step 6:
The number 18 fits into 27 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 27411.0
The remainder is 9 after subtracting 18 from 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
18 goes into 90 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 27411.5
If we take 90 away from 90, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
The number 18 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 27411.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
0 divided by 18 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 27411.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 27411.5 with a remaining 0.0.