We're dividing 393619 by 25 
The aim is to understand the frequency of 25 in 393619.

Going ahead to step 1:
25 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 25

On to step 2:
39 divided by 25 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 25 from 39 and we're left with 14.
Append the next digit (3) from the dividend to 14 and continue with: 143 / 25

Step 3:
The number 25 fits into 143 5 times, leaving a remainder of 18.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 125 from 143, we get 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 25

Let's proceed to step 4:
186 divided by 25 is 7 with a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 157.0
Subtracting 175 from 186 leaves us with 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 25

On to step 5:
25 goes into 111 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 1574.0
If we subtract 100 from 111, we get 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 25

Step 6:
25 can be fit into 119 4 times, resulting in a remainder of 19.
The next digit of our result is 4. 
Result so far: 15744.0
Deduct 100 from 119 and we're left 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.

Moving on to step 7:
The number 25 fits into 190 7 times, leaving a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 15744.7
Subtract 175 from 190 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
When dividing 150 by 25, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 15744.76
If we subtract 150 from 150, 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.

Going ahead to step 9:
25 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 15744.76
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.

Step 10:
If we divide 0 by 25, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 15744.76
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.

Our division results in 15744.76 with a remaining 0.0.