We're dividing 406286 by 25 
The aim is to understand the frequency of 25 in 406286.

Going ahead to step 1:
If we divide 4 by 25, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 25

Step 2:
The number 25 fits into 40 1 times, leaving a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 25 from 40 to get 15.
Include the next digit (6) from the dividend after 15, then repeat: 156 / 25

Advancing to step 3:
The number 25 fits into 156 6 times, leaving a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 150 from 156 leaves us with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 25

Going ahead to step 4:
If we divide 62 by 25, we get 2 and a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 162.0
If we subtract 50 from 62, we get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 25

Let's proceed to step 5:
25 goes into 128 5 times with a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 1625.0
Deduct 125 from 128 and we're left with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 25

Moving on to step 6:
If we divide 36 by 25, we get 1 and a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 16251.0
Subtracting 25 from 36 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
25 can be fit into 110 4 times, resulting in a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 16251.4
If we take 100 away from 110, we end up 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.

Moving on to step 8:
100 divided by 25 is 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 16251.44
If we take 100 away from 100, 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.

The quotient of the division is 16251.44, and the remainder is 0.0.