We look at the division of 647599 by 25 
The aim is to understand the frequency of 25 in 647599.

Going ahead to step 1:
25 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 25

Moving on to step 2:
If we divide 64 by 25, we get 2 and a remainder of 14.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 50 from 64 leaves us with 14.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 25

Advancing to step 3:
The number 25 fits into 147 5 times, leaving a remainder of 22.
Write down 5 as next digit of the result. 
Result so far: 25.0
If we take 125 away from 147, we end up with 22.
Include the next digit (5) from the dividend after 22, then repeat: 225 / 25

Going ahead to step 4:
225 divided by 25 is 9 with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 259.0
The remainder is 0 after subtracting 225 from 225.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 25

Going ahead to step 5:
When dividing 9 by 25, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 2590.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 25

Advancing to step 6:
25 can be fit into 99 3 times, resulting in a remainder of 24.
Record the quotient 3 as the next digit in the result. 
Result so far: 25903.0
Subtracting 75 from 99 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.

Moving on to step 7:
25 goes into 240 9 times with a remainder of 15.
The number 9 becomes the next digit in our result. 
Result so far: 25903.9
Subtracting 225 from 240 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 8:
150 divided by 25 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 25903.96
Deduct 150 from 150 and we're left 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.

Let's proceed to step 9:
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: 25903.96
The remainder is 0 after subtracting 0 from 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:
0 divided by 25 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 25903.96
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 25903.96 and a remainder of 0.0.