870587 ÷ 25 
The aim is to understand the frequency of 25 in 870587.

Step 1:
The number 25 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 25

Moving on to step 2:
25 goes into 87 3 times with a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 75 away from 87, we end up with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 25

On to step 3:
25 can be fit into 120 4 times, resulting in a remainder of 20.
The next digit of our result is 4. 
Result so far: 34.0
If we subtract 100 from 120, we get 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 25

Advancing to step 4:
The number 25 fits into 205 8 times, leaving a remainder of 5.
Put 8 as the next digit of the answer. 
Result so far: 348.0
The remainder is 5 after subtracting 200 from 205.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 25

Advancing to step 5:
58 divided by 25 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3482.0
Subtracting 50 from 58 leaves us with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 25

Step 6:
25 goes into 87 3 times with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 34823.0
If we take 75 away from 87, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
25 goes into 120 4 times with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 34823.4
If we subtract 100 from 120, 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.

Going ahead to step 8:
25 can be fit into 200 8 times, resulting in a remainder of 0.
The next digit of our result is 8. 
Result so far: 34823.48
Subtract 200 from 200 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.

Let's proceed to step 9:
25 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 34823.48
If we take 0 away from 0, we end up 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.

On to step 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 34823.48
If we take 0 away from 0, we end up 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.

Our division results in 34823.48 with a remaining 0.0.