921364 ÷ 15 
The aim is to understand the frequency of 15 in 921364.

On to step 1:
15 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Include the next digit (2) from the dividend after 9, then repeat: 92 / 15

Advancing to step 2:
When dividing 92 by 15, we get 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 90 away from 92, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 15

Step 3:
21 divided by 15 is 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 61.0
Subtracting 15 from 21 leaves us with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 15

Let's proceed to step 4:
If we divide 63 by 15, we get 4 and a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 614.0
Deduct 60 from 63 and we're left with 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 15

Let's proceed to step 5:
When dividing 36 by 15, we get 2 with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 6142.0
The remainder is 6 after subtracting 30 from 36.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 15

Step 6:
15 can be fit into 64 4 times, resulting in a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 61424.0
If we take 60 away from 64, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
The number 15 fits into 40 2 times, leaving a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 61424.2
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.

Going ahead to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 61424.26
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.

Going ahead to step 9:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 61424.266
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.

After the division, we end up with 61424.266 and a remainder of 0.001.