Let's divide 838535 by 15
The aim is to understand the frequency of 15 in 838535.

Step 1:
8 divided by 15 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 15

Advancing to step 2:
If we divide 83 by 15, we get 5 and a remainder of 8.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 75 from 83 to get 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 15

Going ahead to step 3:
15 can be fit into 88 5 times, resulting in a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 55.0
Subtract 75 from 88 to get 13.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 15

Let's proceed to step 4:
When dividing 135 by 15, we get 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 559.0
Subtracting 135 from 135 leaves us with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 15

Step 5:
15 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 5590.0
Subtract 0 from 3 to get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 15

Moving on to step 6:
If we divide 35 by 15, we get 2 and a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 55902.0
If we subtract 30 from 35, we 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 7:
50 divided by 15 is 3 with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 55902.3
The remainder is 5 after subtracting 45 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
When dividing 50 by 15, we get 3 with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 55902.33
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 55902.33 and a remainder of 0.005.