We look at the division of 156912 by 25 
The aim is to understand the frequency of 25 in 156912.

On to step 1:
When dividing 1 by 25, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 25

Advancing to step 2:
25 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 25

Moving on to step 3:
When dividing 156 by 25, we get 6 with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 150 from 156, we get 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 25

Advancing to step 4:
25 can be fit into 69 2 times, resulting in a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 62.0
Deduct 50 from 69 and we're left with 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 25

Advancing to step 5:
When dividing 191 by 25, we get 7 with a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 627.0
Deduct 175 from 191 and we're left with 16.
Append the next digit (2) from the dividend to 16 and continue with: 162 / 25

Going ahead to step 6:
When dividing 162 by 25, we get 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 6276.0
The remainder is 12 after subtracting 150 from 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 7:
When dividing 120 by 25, we get 4 with a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 6276.4
Subtracting 100 from 120 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
200 divided by 25 is 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 6276.48
Subtract 200 from 200 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.

Step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 6276.48
Deduct 0 from 0 and we're left 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.

Going ahead to step 10:
When dividing 0 by 25, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6276.48
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.

After the division, we end up with 6276.48 and a remainder of 0.0.