258859 divided by 26 
The aim is to understand the frequency of 26 in 258859.

Going ahead to step 1:
26 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 26

Moving on to step 2:
26 goes into 25 0 times with a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Bring next digit (8) of the dividend behind the 25 and repeat the process: 258 / 26

On to step 3:
258 divided by 26 is 9 with a remainder of 24.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 234 from 258 and we're left with 24.
Grab the next digit (8) from the dividend, add it to 24, then carry on: 248 / 26

Moving on to step 4:
248 divided by 26 is 9 with a remainder of 14.
The next digit of our result is 9. 
Result so far: 99.0
If we subtract 234 from 248, we get 14.
Include the next digit (5) from the dividend after 14, then repeat: 145 / 26

Step 5:
The number 26 fits into 145 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 995.0
If we take 130 away from 145, we end up with 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 26

On to step 6:
26 can be fit into 159 6 times, resulting in a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 9956.0
Subtract 156 from 159 to 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.

Let's proceed to step 7:
The number 26 fits into 30 1 times, leaving a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 9956.1
Deduct 26 from 30 and we're left 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.

Advancing to step 8:
26 can be fit into 40 1 times, resulting in a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 9956.11
Subtracting 26 from 40 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 9956.11 with a remainder of 0.014.