We're dividing 255681 by 13 
The aim is to understand the frequency of 13 in 255681.

Going ahead to step 1:
The number 13 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 13

Advancing to step 2:
If we divide 25 by 13, we get 1 and a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 13 from 25 leaves us with 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 13

Advancing to step 3:
125 divided by 13 is 9 with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 19.0
If we subtract 117 from 125, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 13

Going ahead to step 4:
When dividing 86 by 13, we get 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 196.0
Subtracting 78 from 86 leaves us with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 13

Moving on to step 5:
If we divide 88 by 13, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 1966.0
The remainder is 10 after subtracting 78 from 88.
Take the next digit (1) from the dividend and append it to 10, then repeat: 101 / 13

Let's proceed to step 6:
The number 13 fits into 101 7 times, leaving a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 19667.0
Deduct 91 from 101 and we're left 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.

Step 7:
The number 13 fits into 100 7 times, leaving a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 19667.7
Deduct 91 from 100 and we're left 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.

Step 8:
If we divide 90 by 13, we get 6 and a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 19667.76
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 9:
If we divide 120 by 13, we get 9 and a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 19667.769
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.

Advancing to step 10:
The number 13 fits into 30 2 times, leaving a remainder of 4.
The next digit of our result is 2. 
Result so far: 19667.7692
The remainder is 4 after subtracting 26 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
13 can be fit into 40 3 times, resulting in a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 19667.76923
If we take 39 away from 40, we end up 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.

Step 12:
When dividing 10 by 13, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 19667.76923
Deduct 0 from 10 and we're left 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.

Advancing to step 13:
The number 13 fits into 100 7 times, leaving a remainder of 9.
The next digit of our result is 7. 
Result so far: 19667.7692307
If we take 91 away from 100, 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.

On to step 14:
90 divided by 13 is 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 19667.76923076
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.

After the division, we end up with 19667.76923076 and a remainder of 1.2e-08.