638961 divided by 26 
The aim is to understand the frequency of 26 in 638961.

Advancing to step 1:
6 divided by 26 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 26

On to step 2:
If we divide 63 by 26, we get 2 and a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 11 after subtracting 52 from 63.
Fetch the next digit (8) from the dividend, attach it to 11 and continue: 118 / 26

On to step 3:
26 can be fit into 118 4 times, resulting in a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 24.0
If we subtract 104 from 118, we get 14.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 26

Advancing to step 4:
If we divide 149 by 26, we get 5 and a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 245.0
If we subtract 130 from 149, we get 19.
Include the next digit (6) from the dividend after 19, then repeat: 196 / 26

Moving on to step 5:
196 divided by 26 is 7 with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 2457.0
Subtracting 182 from 196 leaves us with 14.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 26

Moving on to step 6:
141 divided by 26 is 5 with a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 24575.0
Subtracting 130 from 141 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
The number 26 fits into 110 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 24575.4
The remainder is 6 after subtracting 104 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
If we divide 60 by 26, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 24575.42
The remainder is 8 after subtracting 52 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 9:
If we divide 80 by 26, we get 3 and a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 24575.423
If we take 78 away from 80, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
20 divided by 26 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 24575.423
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
26 goes into 200 7 times with a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 24575.42307
The remainder is 18 after subtracting 182 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 12:
26 goes into 180 6 times with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 24575.423076
Subtracting 156 from 180 leaves us 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.

On to step 13:
26 goes into 240 9 times with a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 24575.4230769
Subtract 234 from 240 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 14:
When dividing 60 by 26, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 24575.42307692
The remainder is 8 after subtracting 52 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 24575.42307692 with a remaining 8e-09.