Let's divide 395925 by 15
The aim is to understand the frequency of 15 in 395925.

On to step 1:
15 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 15

Moving on to step 2:
15 can be fit into 39 2 times, resulting in a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 30 from 39, we get 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 15

Step 3:
When dividing 95 by 15, we get 6 with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 26.0
Subtracting 90 from 95 leaves us with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 15

Advancing to step 4:
If we divide 59 by 15, we get 3 and a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 263.0
If we subtract 45 from 59, we get 14.
Bring next digit (2) of the dividend behind the 14 and repeat the process: 142 / 15

On to step 5:
When dividing 142 by 15, we get 9 with a remainder of 7.
The next digit of our result is 9. 
Result so far: 2639.0
If we take 135 away from 142, we end up with 7.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 15

Going ahead to step 6:
15 goes into 75 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 26395.0
If we subtract 75 from 75, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
If we divide 0 by 15, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 26395.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 26395.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 26395.0 with a remainder of 0.0.