916390 ÷ 15 
The aim is to understand the frequency of 15 in 916390.

Going ahead to step 1:
The number 15 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 15

Moving on to step 2:
When dividing 91 by 15, we get 6 with a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 1 after subtracting 90 from 91.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 15

Going ahead to step 3:
15 can be fit into 16 1 times, resulting in a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 61.0
The remainder is 1 after subtracting 15 from 16.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 15

Let's proceed to step 4:
13 divided by 15 is 0 with a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 610.0
The remainder is 13 after subtracting 0 from 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 15

Moving on to step 5:
When dividing 139 by 15, we get 9 with a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 6109.0
Subtracting 135 from 139 leaves us with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 15

Let's proceed to step 6:
15 goes into 40 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 61092.0
Deduct 30 from 40 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.

Step 7:
15 can be fit into 100 6 times, resulting in a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 61092.6
Subtracting 90 from 100 leaves us 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.

Step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
The next digit of our result is 6. 
Result so far: 61092.66
If we subtract 90 from 100, we 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.

The final outcome is 61092.66, with a leftover of 0.01.