Let's divide 307964 by 15
The aim is to understand the frequency of 15 in 307964.

On to step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 15

On to step 2:
15 goes into 30 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 30 from 30 and we're left with 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 15

Let's proceed to step 3:
15 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 20.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 15

On to step 4:
When dividing 79 by 15, we get 5 with a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 205.0
Subtracting 75 from 79 leaves us with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 15

Let's proceed to step 5:
46 divided by 15 is 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 2053.0
If we subtract 45 from 46, we get 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 15

On to step 6:
When dividing 14 by 15, we get 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 20530.0
The remainder is 14 after subtracting 0 from 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
15 goes into 140 9 times with a remainder of 5.
The next digit of our result is 9. 
Result so far: 20530.9
Subtracting 135 from 140 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.

Advancing to step 8:
When dividing 50 by 15, we get 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 20530.93
The remainder is 5 after subtracting 45 from 50.
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.
Write down 3 as next digit of the result. 
Result so far: 20530.933
The remainder is 5 after subtracting 45 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 20530.933 with a remaining 0.0005.