We divide 666484 by 25
The aim is to understand the frequency of 25 in 666484.

On to step 1:
6 divided by 25 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 25

On to step 2:
If we divide 66 by 25, we get 2 and a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 50 from 66 leaves us with 16.
Append the next digit (6) from the dividend to 16 and continue with: 166 / 25

Advancing to step 3:
166 divided by 25 is 6 with a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 26.0
The remainder is 16 after subtracting 150 from 166.
Fetch the next digit (4) from the dividend, attach it to 16 and continue: 164 / 25

Moving on to step 4:
When dividing 164 by 25, we get 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 266.0
Subtracting 150 from 164 leaves us with 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 25

Moving on to step 5:
25 can be fit into 148 5 times, resulting in a remainder of 23.
Use 5 as the next digit of our solution. 
Result so far: 2665.0
Subtracting 125 from 148 leaves us with 23.
Grab the next digit (4) from the dividend, add it to 23, then carry on: 234 / 25

Step 6:
234 divided by 25 is 9 with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 26659.0
If we take 225 away from 234, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
25 can be fit into 90 3 times, resulting in a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 26659.3
If we take 75 away from 90, we end up 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:
The number 25 fits into 150 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 26659.36
Subtracting 150 from 150 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.

Going ahead to step 9:
25 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 26659.36
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 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 26659.36
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 26659.36 and a remainder of 0.0.