We look at the division of 758637 by 15 
The aim is to understand the frequency of 15 in 758637.

On 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.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 15

Let's proceed to step 2:
75 divided by 15 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 75 from 75, we get 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 15

Step 3:
When dividing 8 by 15, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 15

Going ahead to step 4:
15 goes into 86 5 times with a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 505.0
The remainder is 11 after subtracting 75 from 86.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 15

On to step 5:
15 goes into 113 7 times with a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 5057.0
Subtracting 105 from 113 leaves us with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 15

Advancing to step 6:
15 goes into 87 5 times with a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 50575.0
Deduct 75 from 87 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
15 goes into 120 8 times with a remainder of 0.
The next digit of our result is 8. 
Result so far: 50575.8
Subtract 120 from 120 to 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.

Moving on to step 8:
15 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 50575.8
If we subtract 0 from 0, 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.

Let's proceed to step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 50575.8
Subtract 0 from 0 to 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.

The final result is 50575.8 with a remainder of 0.0.