Let's divide 709409 by 15
The aim is to understand the frequency of 15 in 709409.

Going ahead to step 1:
When dividing 7 by 15, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 15

Advancing to step 2:
15 can be fit into 70 4 times, resulting in a remainder of 10.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 60 from 70 and we're left with 10.
Fetch the next digit (9) from the dividend, attach it to 10 and continue: 109 / 15

On to step 3:
15 can be fit into 109 7 times, resulting in a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 47.0
Subtracting 105 from 109 leaves us with 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 15

Going ahead to step 4:
44 divided by 15 is 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 472.0
The remainder is 14 after subtracting 30 from 44.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 15

Advancing to step 5:
140 divided by 15 is 9 with a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 4729.0
If we take 135 away from 140, we end up with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 15

Moving on to step 6:
59 divided by 15 is 3 with a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 47293.0
If we subtract 45 from 59, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 47293.9
If we take 135 away from 140, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
50 divided by 15 is 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 47293.93
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 47293.933
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 47293.933, with a leftover of 0.0005.