We're dividing 404321 by 25 
The aim is to understand the frequency of 25 in 404321.

Advancing to step 1:
25 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 25

Moving on to step 2:
25 goes into 40 1 times with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 25 from 40 to get 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 25

Step 3:
If we divide 154 by 25, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we subtract 150 from 154, we get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 25

Let's proceed to step 4:
The number 25 fits into 43 1 times, leaving a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 161.0
If we subtract 25 from 43, we get 18.
Take the next digit (2) from the dividend and append it to 18, then repeat: 182 / 25

Let's proceed to step 5:
25 goes into 182 7 times with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 1617.0
If we take 175 away from 182, we end up with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 25

Step 6:
25 goes into 71 2 times with a remainder of 21.
Use 2 as the next digit of our solution. 
Result so far: 16172.0
If we take 50 away from 71, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
When dividing 210 by 25, we get 8 with a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 16172.8
Subtract 200 from 210 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
When dividing 100 by 25, we get 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 16172.84
The remainder is 0 after subtracting 100 from 100.
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:
0 divided by 25 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 16172.84
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.

Moving on to step 10:
0 divided by 25 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16172.84
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.

Our division results in 16172.84 with a remaining 0.0.