553517 divided by 15 
The aim is to understand the frequency of 15 in 553517.

On to step 1:
5 divided by 15 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 15

Going ahead to step 2:
If we divide 55 by 15, we get 3 and a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 10 after subtracting 45 from 55.
Append the next digit (3) from the dividend to 10 and continue with: 103 / 15

Advancing to step 3:
When dividing 103 by 15, we get 6 with a remainder of 13.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Subtracting 90 from 103 leaves us with 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 15

On to step 4:
If we divide 135 by 15, we get 9 and a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 369.0
Subtract 135 from 135 to get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 15

On to step 5:
If we divide 1 by 15, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 3690.0
Subtract 0 from 1 to get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 15

Step 6:
15 can be fit into 17 1 times, resulting in a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 36901.0
If we subtract 15 from 17, 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.
Record the quotient 1 as the next digit in the result. 
Result so far: 36901.1
The remainder is 5 after subtracting 15 from 20.
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:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 36901.13
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.

Let's proceed to step 9:
15 goes into 50 3 times with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 36901.133
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.

In conclusion, the division gives 36901.133 with a balance of 0.0005.