We look at the division of 843505 by 25 
The aim is to understand the frequency of 25 in 843505.

Moving on to step 1:
25 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 25

Step 2:
25 goes into 84 3 times with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 9 after subtracting 75 from 84.
Take the next digit (3) from the dividend and append it to 9, then repeat: 93 / 25

Let's proceed to step 3:
If we divide 93 by 25, we get 3 and a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 33.0
Subtracting 75 from 93 leaves us with 18.
Grab the next digit (5) from the dividend, add it to 18, then carry on: 185 / 25

On to step 4:
25 can be fit into 185 7 times, resulting in a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 337.0
Subtracting 175 from 185 leaves us with 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 25

Advancing to step 5:
25 goes into 100 4 times with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 3374.0
Subtract 100 from 100 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 25

Step 6:
If we divide 5 by 25, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 33740.0
If we subtract 0 from 5, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
50 divided by 25 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 33740.2
The remainder is 0 after subtracting 50 from 50.
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 8:
25 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 33740.2
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.

On to step 9:
When dividing 0 by 25, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 33740.2
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.

After the division, we end up with 33740.2 and a remainder of 0.0.