We look at the division of 909875 by 25 
The aim is to understand the frequency of 25 in 909875.

Let's proceed to step 1:
The number 25 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 25

Advancing to step 2:
25 can be fit into 90 3 times, resulting in a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 75 from 90 leaves us with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 25

Advancing to step 3:
When dividing 159 by 25, we get 6 with a remainder of 9.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Deduct 150 from 159 and we're left with 9.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 25

Going ahead to step 4:
25 goes into 98 3 times with a remainder of 23.
The next digit of our result is 3. 
Result so far: 363.0
Subtracting 75 from 98 leaves us with 23.
Fetch the next digit (7) from the dividend, attach it to 23 and continue: 237 / 25

Advancing to step 5:
25 can be fit into 237 9 times, resulting in a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 3639.0
If we take 225 away from 237, we end up with 12.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 25

Going ahead to step 6:
125 divided by 25 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 36395.0
The remainder is 0 after subtracting 125 from 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 36395.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 25, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 36395.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 36395.0 with a remainder of 0.0.