648918 divided by 15 
The aim is to understand the frequency of 15 in 648918.

Moving on to step 1:
If we divide 6 by 15, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 15

Going ahead to step 2:
64 divided by 15 is 4 with a remainder of 4.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 4 after subtracting 60 from 64.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 15

Step 3:
15 can be fit into 48 3 times, resulting in a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
The remainder is 3 after subtracting 45 from 48.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 15

On to step 4:
If we divide 39 by 15, we get 2 and a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 432.0
Subtracting 30 from 39 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 15

Let's proceed to step 5:
When dividing 91 by 15, we get 6 with a remainder of 1.
The next digit of our result is 6. 
Result so far: 4326.0
Subtract 90 from 91 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 15

Moving on to step 6:
The number 15 fits into 18 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 43261.0
If we take 15 away from 18, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
15 goes into 30 2 times with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 43261.2
The remainder is 0 after subtracting 30 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 43261.2
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 43261.2
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 43261.2 with a remaining 0.0.