We divide 312813 by 25
The aim is to understand the frequency of 25 in 312813.

On to step 1:
The number 25 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 25

On to step 2:
25 can be fit into 31 1 times, resulting in a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 6 after subtracting 25 from 31.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 25

Going ahead to step 3:
If we divide 62 by 25, we get 2 and a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 50 from 62 and we're left with 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 25

Step 4:
25 goes into 128 5 times with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 125.0
If we take 125 away from 128, we end up with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 25

Moving on to step 5:
25 can be fit into 31 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 1251.0
Deduct 25 from 31 and we're left with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 25

Step 6:
When dividing 63 by 25, we get 2 with a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 12512.0
If we subtract 50 from 63, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
When dividing 130 by 25, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 12512.5
Subtracting 125 from 130 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
25 can be fit into 50 2 times, resulting in a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 12512.52
If we take 50 away from 50, 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.

On to step 9:
0 divided by 25 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12512.52
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.

Moving on to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12512.52
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.

The final outcome is 12512.52, with a leftover of 0.0.