We're dividing 813641 by 25 
The aim is to understand the frequency of 25 in 813641.

Advancing to step 1:
When dividing 8 by 25, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 25

On to step 2:
25 can be fit into 81 3 times, resulting in a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 75 from 81 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 25

Moving on to step 3:
If we divide 63 by 25, we get 2 and a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Deduct 50 from 63 and we're left with 13.
Bring next digit (6) of the dividend behind the 13 and repeat the process: 136 / 25

Moving on to step 4:
When dividing 136 by 25, we get 5 with a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 325.0
The remainder is 11 after subtracting 125 from 136.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 25

Let's proceed to step 5:
If we divide 114 by 25, we get 4 and a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 3254.0
Subtract 100 from 114 to get 14.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 25

Going ahead to step 6:
25 can be fit into 141 5 times, resulting in a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 32545.0
Subtracting 125 from 141 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 7:
The number 25 fits into 160 6 times, leaving a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 32545.6
The remainder is 10 after subtracting 150 from 160.
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:
If we divide 100 by 25, we get 4 and a remainder of 0.
The next digit of our result is 4. 
Result so far: 32545.64
Deduct 100 from 100 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.

On to step 9:
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: 32545.64
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.

Moving on to step 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 32545.64
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.

Our division results in 32545.64 with a remaining 0.0.