329387 ÷ 15 
The aim is to understand the frequency of 15 in 329387.

Going ahead to step 1:
3 divided by 15 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 15

Let's proceed to step 2:
15 can be fit into 32 2 times, resulting in a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 30 from 32 and we're left with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 15

Moving on to step 3:
If we divide 29 by 15, we get 1 and a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 21.0
Deduct 15 from 29 and we're left with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 15

Let's proceed to step 4:
The number 15 fits into 143 9 times, leaving a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 219.0
The remainder is 8 after subtracting 135 from 143.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 15

On to step 5:
15 goes into 88 5 times with a remainder of 13.
Write down 5 as next digit of the result. 
Result so far: 2195.0
Deduct 75 from 88 and we're left with 13.
Take the next digit (7) from the dividend and append it to 13, then repeat: 137 / 15

Going ahead to step 6:
15 goes into 137 9 times with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 21959.0
If we subtract 135 from 137, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
The number 15 fits into 20 1 times, leaving a remainder of 5.
The next digit of our result is 1. 
Result so far: 21959.1
Subtracting 15 from 20 leaves us 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.

Going ahead to step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 21959.13
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.

Advancing to step 9:
15 goes into 50 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 21959.133
Subtracting 45 from 50 leaves us 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.

After the division, we end up with 21959.133 and a remainder of 0.0005.