We look at the division of 313170 by 15 
The aim is to understand the frequency of 15 in 313170.

Going ahead to step 1:
3 divided by 15 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 15

Step 2:
15 goes into 31 2 times with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 30 from 31 leaves us with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 15

On to step 3:
The number 15 fits into 13 0 times, leaving a remainder of 13.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 13 leaves us with 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 15

Let's proceed to step 4:
131 divided by 15 is 8 with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 208.0
Subtracting 120 from 131 leaves us with 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 15

Step 5:
When dividing 117 by 15, we get 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 2087.0
Deduct 105 from 117 and we're left with 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 15

Going ahead to step 6:
15 goes into 120 8 times with a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 20878.0
If we take 120 away from 120, 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.

Let's proceed to step 7:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20878.0
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.

Let's proceed to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 20878.0
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.

The final result is 20878.0 with a remainder of 0.0.