We look at the division of 852690 by 13 
The aim is to understand the frequency of 13 in 852690.

On to step 1:
8 divided by 13 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 13

Step 2:
The number 13 fits into 85 6 times, leaving a remainder of 7.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we take 78 away from 85, we end up with 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 13

On to step 3:
13 can be fit into 72 5 times, resulting in a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 65.0
Deduct 65 from 72 and we're left with 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 13

On to step 4:
When dividing 76 by 13, we get 5 with a remainder of 11.
The next digit of our result is 5. 
Result so far: 655.0
Subtracting 65 from 76 leaves us with 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 13

On to step 5:
119 divided by 13 is 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 6559.0
Subtract 117 from 119 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 13

On to step 6:
13 can be fit into 20 1 times, resulting in a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 65591.0
Subtracting 13 from 20 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
The number 13 fits into 70 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 65591.5
Subtracting 65 from 70 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.

Step 8:
The number 13 fits into 50 3 times, leaving a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 65591.53
Subtracting 39 from 50 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
When dividing 110 by 13, we get 8 with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 65591.538
Deduct 104 from 110 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 10:
13 goes into 60 4 times with a remainder of 8.
The next digit of our result is 4. 
Result so far: 65591.5384
Subtracting 52 from 60 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
13 goes into 80 6 times with a remainder of 2.
The next digit of our result is 6. 
Result so far: 65591.53846
The remainder is 2 after subtracting 78 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 12:
The number 13 fits into 20 1 times, leaving a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 65591.538461
If we subtract 13 from 20, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 13:
The number 13 fits into 70 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 65591.5384615
If we take 65 away from 70, we end up 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.

Going ahead to step 14:
The number 13 fits into 50 3 times, leaving a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 65591.53846153
Subtracting 39 from 50 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final outcome is 65591.53846153, with a leftover of 1.1e-08.