We look at the division of 559853 by 15 
The aim is to understand the frequency of 15 in 559853.

Going ahead to step 1:
15 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 15

Moving on to step 2:
When dividing 55 by 15, we get 3 with a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 45 from 55 to get 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 15

Let's proceed to step 3:
If we divide 109 by 15, we get 7 and a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 37.0
If we subtract 105 from 109, we get 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 15

Step 4:
If we divide 48 by 15, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 373.0
Deduct 45 from 48 and we're left with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 15

Moving on to step 5:
35 divided by 15 is 2 with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 3732.0
Deduct 30 from 35 and we're left with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 15

Advancing to step 6:
15 can be fit into 53 3 times, resulting in a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 37323.0
Subtracting 45 from 53 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
If we divide 80 by 15, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 37323.5
The remainder is 5 after subtracting 75 from 80.
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:
15 goes into 50 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 37323.53
Deduct 45 from 50 and we're left 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.

On to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 37323.533
If we subtract 45 from 50, 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.

The final result is 37323.533 with a remainder of 0.0005.