We look at the division of 435673 by 25 
The aim is to understand the frequency of 25 in 435673.

Going ahead to step 1:
25 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 25

Let's proceed to step 2:
When dividing 43 by 25, we get 1 with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 25 from 43 and we're left with 18.
Include the next digit (5) from the dividend after 18, then repeat: 185 / 25

Going ahead to step 3:
25 can be fit into 185 7 times, resulting in a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we subtract 175 from 185, we get 10.
Bring next digit (6) of the dividend behind the 10 and repeat the process: 106 / 25

Let's proceed to step 4:
If we divide 106 by 25, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 174.0
Subtracting 100 from 106 leaves us with 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 25

Moving on to step 5:
25 can be fit into 67 2 times, resulting in a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 1742.0
If we subtract 50 from 67, we get 17.
Include the next digit (3) from the dividend after 17, then repeat: 173 / 25

On to step 6:
When dividing 173 by 25, we get 6 with a remainder of 23.
Put 6 as the next digit of the answer. 
Result so far: 17426.0
Deduct 150 from 173 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 7:
The number 25 fits into 230 9 times, leaving a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 17426.9
Subtracting 225 from 230 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
If we divide 50 by 25, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 17426.92
Subtract 50 from 50 to 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.

Moving on to step 9:
0 divided by 25 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 17426.92
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:
If we divide 0 by 25, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 17426.92
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 17426.92 and a remainder of 0.0.