978575 divided by 13 
The aim is to understand the frequency of 13 in 978575.

Step 1:
When dividing 9 by 13, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (7) from the dividend after 9, then repeat: 97 / 13

Moving on to step 2:
If we divide 97 by 13, we get 7 and a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 91 from 97, we get 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 13

Let's proceed to step 3:
68 divided by 13 is 5 with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 75.0
If we subtract 65 from 68, we get 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 13

Let's proceed to step 4:
13 can be fit into 35 2 times, resulting in a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 752.0
The remainder is 9 after subtracting 26 from 35.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 13

Let's proceed to step 5:
13 can be fit into 97 7 times, resulting in a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 7527.0
If we subtract 91 from 97, we get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 13

Advancing to step 6:
The number 13 fits into 65 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 75275.0
If we take 65 away from 65, 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.

Going ahead to step 7:
13 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 75275.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
13 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: 75275.0
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.

Our division results in 75275.0 with a remaining 0.0.