509875 ÷ 26 
The aim is to understand the frequency of 26 in 509875.

On to step 1:
5 divided by 26 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (0) from the dividend after 5, then repeat: 50 / 26

Going ahead to step 2:
26 can be fit into 50 1 times, resulting in a remainder of 24.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 26 from 50, we get 24.
Append the next digit (9) from the dividend to 24 and continue with: 249 / 26

Going ahead to step 3:
When dividing 249 by 26, we get 9 with a remainder of 15.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 234 from 249 to get 15.
Include the next digit (8) from the dividend after 15, then repeat: 158 / 26

On to step 4:
26 can be fit into 158 6 times, resulting in a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 196.0
If we take 156 away from 158, we end up with 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 26

On to step 5:
The number 26 fits into 27 1 times, leaving a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1961.0
Subtract 26 from 27 to get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 26

Moving on to step 6:
The number 26 fits into 15 0 times, leaving a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 19610.0
Subtracting 0 from 15 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
150 divided by 26 is 5 with a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 19610.5
If we subtract 130 from 150, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
The number 26 fits into 200 7 times, leaving a remainder of 18.
The next digit of our result is 7. 
Result so far: 19610.57
Subtracting 182 from 200 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 9:
180 divided by 26 is 6 with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 19610.576
Deduct 156 from 180 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 10:
The number 26 fits into 240 9 times, leaving a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 19610.5769
The remainder is 6 after subtracting 234 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
60 divided by 26 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 19610.57692
Deduct 52 from 60 and we're left 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.

Going ahead to step 12:
The number 26 fits into 80 3 times, leaving a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 19610.576923
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.

Advancing to step 13:
The number 26 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 19610.576923
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 14:
26 goes into 200 7 times with a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 19610.57692307
Subtract 182 from 200 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final result is 19610.57692307 with a remainder of 1.8e-08.