We look at the division of 918731 by 15 
The aim is to understand the frequency of 15 in 918731.

Let's proceed to step 1:
9 divided by 15 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 15

Going ahead to step 2:
The number 15 fits into 91 6 times, leaving a remainder of 1.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 1 after subtracting 90 from 91.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 15

Advancing to step 3:
15 goes into 18 1 times with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 61.0
Deduct 15 from 18 and we're left with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 15

Moving on to step 4:
37 divided by 15 is 2 with a remainder of 7.
The next digit of our result is 2. 
Result so far: 612.0
Subtract 30 from 37 to get 7.
Append the next digit (3) from the dividend to 7 and continue with: 73 / 15

Step 5:
The number 15 fits into 73 4 times, leaving a remainder of 13.
Write down 4 as next digit of the result. 
Result so far: 6124.0
Subtracting 60 from 73 leaves us with 13.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 15

On to step 6:
131 divided by 15 is 8 with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 61248.0
The remainder is 11 after subtracting 120 from 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
110 divided by 15 is 7 with a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 61248.7
The remainder is 5 after subtracting 105 from 110.
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 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 61248.73
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:
If we divide 50 by 15, we get 3 and a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 61248.733
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.

The final outcome is 61248.733, with a leftover of 0.0005.