We look at the division of 77479 by 13 
The aim is to understand the frequency of 13 in 77479.

Advancing to step 1:
13 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 13

Advancing to step 2:
77 divided by 13 is 5 with a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 65 from 77 and we're left with 12.
Grab the next digit (4) from the dividend, add it to 12, then carry on: 124 / 13

Moving on to step 3:
If we divide 124 by 13, we get 9 and a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 59.0
If we subtract 117 from 124, we get 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 13

On to step 4:
If we divide 77 by 13, we get 5 and a remainder of 12.
Put 5 as the next digit of the answer. 
Result so far: 595.0
Subtracting 65 from 77 leaves us with 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 13

Advancing to step 5:
When dividing 129 by 13, we get 9 with a remainder of 12.
Record the quotient 9 as the next digit in the result. 
Result so far: 5959.0
The remainder is 12 after subtracting 117 from 129.
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 6:
When dividing 120 by 13, we get 9 with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 5959.9
If we subtract 117 from 120, we get 3.
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 7:
13 can be fit into 30 2 times, resulting in a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 5959.92
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.

Advancing to step 8:
13 can be fit into 40 3 times, resulting in a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 5959.923
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 9:
13 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 5959.923
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
100 divided by 13 is 7 with a remainder of 9.
The next digit of our result is 7. 
Result so far: 5959.92307
Subtracting 91 from 100 leaves us 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.

Going ahead to step 11:
When dividing 90 by 13, we get 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 5959.923076
If we subtract 78 from 90, we 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.

Advancing to step 12:
When dividing 120 by 13, we get 9 with a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 5959.9230769
If we take 117 away from 120, we end up 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 13:
The number 13 fits into 30 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 5959.92307692
If we take 26 away from 30, we end up 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.

After the division, we end up with 5959.92307692 and a remainder of 4e-09.