968689 divided by 15 
The aim is to understand the frequency of 15 in 968689.

On to step 1:
15 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 15

Going ahead to step 2:
When dividing 96 by 15, we get 6 with a remainder of 6.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 6 after subtracting 90 from 96.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 15

Advancing to step 3:
If we divide 68 by 15, we get 4 and a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 64.0
Subtracting 60 from 68 leaves us with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 15

Step 4:
If we divide 86 by 15, we get 5 and a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 645.0
The remainder is 11 after subtracting 75 from 86.
Fetch the next digit (8) from the dividend, attach it to 11 and continue: 118 / 15

Advancing to step 5:
The number 15 fits into 118 7 times, leaving a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 6457.0
If we subtract 105 from 118, we get 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 15

Let's proceed to step 6:
When dividing 139 by 15, we get 9 with a remainder of 4.
The next digit of our result is 9. 
Result so far: 64579.0
The remainder is 4 after subtracting 135 from 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
40 divided by 15 is 2 with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 64579.2
Deduct 30 from 40 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.

Let's proceed to step 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 64579.26
If we take 90 away from 100, we end up 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.

Advancing to step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 64579.266
If we take 90 away from 100, we end up 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 64579.266 and a remainder of 0.001.