We look at the division of 803569 by 25 
The aim is to understand the frequency of 25 in 803569.

Let's proceed to step 1:
25 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 25

Step 2:
The number 25 fits into 80 3 times, leaving a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 75 from 80 leaves us with 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 25

Moving on to step 3:
The number 25 fits into 53 2 times, leaving a remainder of 3.
The next digit of our result is 2. 
Result so far: 32.0
Deduct 50 from 53 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 25

Step 4:
The number 25 fits into 35 1 times, leaving a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 321.0
Subtracting 25 from 35 leaves us with 10.
Append the next digit (6) from the dividend to 10 and continue with: 106 / 25

Going ahead to step 5:
The number 25 fits into 106 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 3214.0
Subtract 100 from 106 to get 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 25

Going ahead to step 6:
25 can be fit into 69 2 times, resulting in a remainder of 19.
The next digit of our result is 2. 
Result so far: 32142.0
Subtracting 50 from 69 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
190 divided by 25 is 7 with a remainder of 15.
The next digit of our result is 7. 
Result so far: 32142.7
Deduct 175 from 190 and we're left 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.

Going ahead to step 8:
The number 25 fits into 150 6 times, leaving a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 32142.76
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.

Advancing to step 9:
When dividing 0 by 25, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 32142.76
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.

On to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 32142.76
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 32142.76 with a remaining 0.0.