819321 divided by 25 
The aim is to understand the frequency of 25 in 819321.

On to step 1:
The number 25 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 25

Advancing to step 2:
81 divided by 25 is 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 75 from 81 to get 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 25

Let's proceed to step 3:
25 goes into 69 2 times with a remainder of 19.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Deduct 50 from 69 and we're left with 19.
Bring next digit (3) of the dividend behind the 19 and repeat the process: 193 / 25

Moving on to step 4:
The number 25 fits into 193 7 times, leaving a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 327.0
If we subtract 175 from 193, we get 18.
Append the next digit (2) from the dividend to 18 and continue with: 182 / 25

Going ahead to step 5:
When dividing 182 by 25, we get 7 with a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 3277.0
The remainder is 7 after subtracting 175 from 182.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 25

On to step 6:
The number 25 fits into 71 2 times, leaving a remainder of 21.
Use 2 as the next digit of our solution. 
Result so far: 32772.0
The remainder is 21 after subtracting 50 from 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
If we divide 210 by 25, we get 8 and a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 32772.8
The remainder is 10 after subtracting 200 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
When dividing 100 by 25, we get 4 with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 32772.84
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:
0 divided by 25 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 32772.84
Subtracting 0 from 0 leaves us 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 10:
25 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 32772.84
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.

Our division results in 32772.84 with a remaining 0.0.