We're dividing 159206 by 25 
The aim is to understand the frequency of 25 in 159206.

Step 1:
The number 25 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 25

Advancing to step 2:
When dividing 15 by 25, we get 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 25

Advancing to step 3:
If we divide 159 by 25, we get 6 and a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 150 from 159 leaves us with 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 25

Step 4:
When dividing 92 by 25, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 63.0
Subtracting 75 from 92 leaves us with 17.
Append the next digit (0) from the dividend to 17 and continue with: 170 / 25

On to step 5:
If we divide 170 by 25, we get 6 and a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 636.0
If we take 150 away from 170, we end up with 20.
Include the next digit (6) from the dividend after 20, then repeat: 206 / 25

Step 6:
If we divide 206 by 25, we get 8 and a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 6368.0
If we take 200 away from 206, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
25 goes into 60 2 times with a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 6368.2
Deduct 50 from 60 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On 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: 6368.24
If we subtract 100 from 100, 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.

Moving on to step 9:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6368.24
If we take 0 away from 0, we end up 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.

Let's proceed to step 10:
25 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6368.24
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.

The final result is 6368.24 with a remainder of 0.0.