We divide 730909 by 18
The aim is to understand the frequency of 18 in 730909.

Going ahead to step 1:
If we divide 7 by 18, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 18

Let's proceed to step 2:
73 divided by 18 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 72 from 73, we get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 18

Going ahead to step 3:
If we divide 10 by 18, we get 0 and a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Deduct 0 from 10 and we're left with 10.
Take the next digit (9) from the dividend and append it to 10, then repeat: 109 / 18

On to step 4:
If we divide 109 by 18, we get 6 and a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 406.0
Deduct 108 from 109 and we're left with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 18

Advancing to step 5:
The number 18 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 4060.0
Subtracting 0 from 10 leaves us with 10.
Fetch the next digit (9) from the dividend, attach it to 10 and continue: 109 / 18

Moving on to step 6:
When dividing 109 by 18, we get 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 40606.0
The remainder is 1 after subtracting 108 from 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
18 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 40606.0
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
The number 18 fits into 100 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 40606.05
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
The number 18 fits into 100 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 40606.055
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 40606.055 and a remainder of 0.001.