87017608 ÷ 25 
The aim is to understand the frequency of 25 in 87017608.

Let's proceed to step 1:
If we divide 8 by 25, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 25

Advancing to step 2:
87 divided by 25 is 3 with a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 75 from 87 leaves us with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 25

On to step 3:
120 divided by 25 is 4 with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 34.0
Subtracting 100 from 120 leaves us with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 25

Going ahead to step 4:
25 goes into 201 8 times with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 348.0
Subtract 200 from 201 to get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 25

Going ahead to step 5:
25 can be fit into 17 0 times, resulting in a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 3480.0
Subtract 0 from 17 to get 17.
Grab the next digit (6) from the dividend, add it to 17, then carry on: 176 / 25

Let's proceed to step 6:
25 goes into 176 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 34807.0
Deduct 175 from 176 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 25

Moving on to step 7:
25 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 348070.0
Subtract 0 from 10 to get 10.
Grab the next digit (8) from the dividend, add it to 10, then carry on: 108 / 25

Moving on to step 8:
The number 25 fits into 108 4 times, leaving a remainder of 8.
The next digit of our result is 4. 
Result so far: 3480704.0
Deduct 100 from 108 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.

Let's proceed to step 9:
25 can be fit into 80 3 times, resulting in a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 3480704.3
The remainder is 5 after subtracting 75 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 10:
The number 25 fits into 50 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 3480704.32
The remainder is 0 after subtracting 50 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 3480704.32
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
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: 3480704.32
Subtracting 0 from 0 leaves us with 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 3480704.32 with a remainder of 0.0.