Let's divide 715609 by 18
The aim is to understand the frequency of 18 in 715609.

On to step 1:
The number 18 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 18

Step 2:
When dividing 71 by 18, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 54 away from 71, we end up with 17.
Fetch the next digit (5) from the dividend, attach it to 17 and continue: 175 / 18

Let's proceed to step 3:
18 can be fit into 175 9 times, resulting in a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtracting 162 from 175 leaves us with 13.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 18

Advancing to step 4:
The number 18 fits into 136 7 times, leaving a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 397.0
Deduct 126 from 136 and we're left with 10.
Take the next digit (0) from the dividend and append it to 10, then repeat: 100 / 18

On to step 5:
18 can be fit into 100 5 times, resulting in a remainder of 10.
The next digit of our result is 5. 
Result so far: 3975.0
If we take 90 away from 100, we end up with 10.
Bring next digit (9) of the dividend behind the 10 and repeat the process: 109 / 18

Let's proceed to step 6:
The number 18 fits into 109 6 times, leaving a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 39756.0
If we take 108 away from 109, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
10 divided by 18 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 39756.0
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.

Let's proceed to step 8:
When dividing 100 by 18, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 39756.05
Subtract 90 from 100 to 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.

Step 9:
18 goes into 100 5 times with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 39756.055
Subtracting 90 from 100 leaves us 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 39756.055 and a remainder of 0.001.