We look at the division of 753520 by 15 
The aim is to understand the frequency of 15 in 753520.

Advancing to step 1:
15 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 15

On to step 2:
The number 15 fits into 75 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 75 from 75 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 15

Moving on to step 3:
When dividing 3 by 15, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 50.0
Subtract 0 from 3 to get 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 15

On to step 4:
When dividing 35 by 15, we get 2 with a remainder of 5.
The next digit of our result is 2. 
Result so far: 502.0
The remainder is 5 after subtracting 30 from 35.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 15

Going ahead to step 5:
52 divided by 15 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 5023.0
If we take 45 away from 52, we end up with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 15

Moving on to step 6:
15 can be fit into 70 4 times, resulting in a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 50234.0
Deduct 60 from 70 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.

Going ahead to step 7:
100 divided by 15 is 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 50234.6
Deduct 90 from 100 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:
15 goes into 100 6 times with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 50234.66
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 50234.66 with a remaining 0.01.