We look at the division of 623076 by 13 
The aim is to understand the frequency of 13 in 623076.

On to step 1:
13 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 13

On to step 2:
13 can be fit into 62 4 times, resulting in a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 52 from 62, we get 10.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 13

Let's proceed to step 3:
When dividing 103 by 13, we get 7 with a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtracting 91 from 103 leaves us with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 13

On to step 4:
13 can be fit into 120 9 times, resulting in a remainder of 3.
The next digit of our result is 9. 
Result so far: 479.0
Deduct 117 from 120 and we're left with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 13

Going ahead to step 5:
The number 13 fits into 37 2 times, leaving a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 4792.0
Deduct 26 from 37 and we're left with 11.
Fetch the next digit (6) from the dividend, attach it to 11 and continue: 116 / 13

Moving on to step 6:
The number 13 fits into 116 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 47928.0
If we take 104 away from 116, 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.

On to step 7:
The number 13 fits into 120 9 times, leaving a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 47928.9
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.

Going ahead to step 8:
When dividing 30 by 13, we get 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 47928.92
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.

Step 9:
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: 47928.923
Subtract 39 from 40 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 10:
The number 13 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 47928.923
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.

Moving on to step 11:
If we divide 100 by 13, we get 7 and a remainder of 9.
The next digit of our result is 7. 
Result so far: 47928.92307
If we subtract 91 from 100, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
When dividing 90 by 13, we get 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 47928.923076
Deduct 78 from 90 and we're left 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.

Step 13:
13 can be fit into 120 9 times, resulting in a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 47928.9230769
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 14:
30 divided by 13 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 47928.92307692
Subtracting 26 from 30 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 47928.92307692, with a leftover of 4e-09.