We look at the division of 321394 by 25 
The aim is to understand the frequency of 25 in 321394.

Step 1:
The number 25 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 25

Moving on to step 2:
When dividing 32 by 25, we get 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 7 after subtracting 25 from 32.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 25

On to step 3:
25 can be fit into 71 2 times, resulting in a remainder of 21.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 50 from 71, we get 21.
Take the next digit (3) from the dividend and append it to 21, then repeat: 213 / 25

Advancing to step 4:
If we divide 213 by 25, we get 8 and a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 128.0
If we subtract 200 from 213, we get 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 25

Step 5:
If we divide 139 by 25, we get 5 and a remainder of 14.
Put 5 as the next digit of the answer. 
Result so far: 1285.0
If we take 125 away from 139, we end up with 14.
Grab the next digit (4) from the dividend, add it to 14, then carry on: 144 / 25

On to step 6:
If we divide 144 by 25, we get 5 and a remainder of 19.
The next digit of our result is 5. 
Result so far: 12855.0
Subtract 125 from 144 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
25 goes into 190 7 times with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 12855.7
If we take 175 away from 190, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
150 divided by 25 is 6 with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 12855.76
If we take 150 away from 150, 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.

Advancing 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: 12855.76
Subtract 0 from 0 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.

Going ahead to step 10:
When dividing 0 by 25, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 12855.76
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.

The final outcome is 12855.76, with a leftover of 0.0.