We look at the division of 86648623 by 13 
The aim is to understand the frequency of 13 in 86648623.

Let's proceed to step 1:
8 divided by 13 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 13

Step 2:
13 goes into 86 6 times with a remainder of 8.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 78 from 86 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 13

Let's proceed to step 3:
13 goes into 86 6 times with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 66.0
The remainder is 8 after subtracting 78 from 86.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 13

On to step 4:
84 divided by 13 is 6 with a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 666.0
Subtracting 78 from 84 leaves us with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 13

Going ahead to step 5:
If we divide 68 by 13, we get 5 and a remainder of 3.
The next digit of our result is 5. 
Result so far: 6665.0
Subtracting 65 from 68 leaves us with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 13

On to step 6:
13 goes into 36 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 66652.0
If we take 26 away from 36, we end up with 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 13

On to step 7:
When dividing 102 by 13, we get 7 with a remainder of 11.
The next digit of our result is 7. 
Result so far: 666527.0
Subtracting 91 from 102 leaves us with 11.
Take the next digit (3) from the dividend and append it to 11, then repeat: 113 / 13

Step 8:
The number 13 fits into 113 8 times, leaving a remainder of 9.
Use 8 as the next digit of our solution. 
Result so far: 6665278.0
If we take 104 away from 113, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 9:
13 goes into 90 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 6665278.6
If we take 78 away from 90, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 10:
When dividing 120 by 13, we get 9 with a remainder of 3.
The next digit of our result is 9. 
Result so far: 6665278.69
Subtracting 117 from 120 leaves us 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.

Step 11:
When dividing 30 by 13, we get 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 6665278.692
Subtract 26 from 30 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
40 divided by 13 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 6665278.6923
Deduct 39 from 40 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 13:
The number 13 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 6665278.6923
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 14:
When dividing 100 by 13, we get 7 with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 6665278.692307
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 15:
13 goes into 90 6 times with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 6665278.6923076
Subtract 78 from 90 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 16:
If we divide 120 by 13, we get 9 and a remainder of 3.
The next digit of our result is 9. 
Result so far: 6665278.69230769
Subtracting 117 from 120 leaves us 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.

Our division results in 6665278.69230769 with a remaining 3e-09.