81399646 ÷ 313 
The aim is to understand the frequency of 313 in 81399646.

Moving on to step 1:
When dividing 8 by 313, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 313

Step 2:
81 divided by 313 is 0 with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Bring next digit (3) of the dividend behind the 81 and repeat the process: 813 / 313

On to step 3:
The number 313 fits into 813 2 times, leaving a remainder of 187.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 626 away from 813, we end up with 187.
Include the next digit (9) from the dividend after 187, then repeat: 1879 / 313

Advancing to step 4:
If we divide 1879 by 313, we get 6 and a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
Subtract 1878 from 1879 to get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 313

Advancing to step 5:
313 goes into 19 0 times with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 260.0
Subtracting 0 from 19 leaves us with 19.
Append the next digit (6) from the dividend to 19 and continue with: 196 / 313

Moving on to step 6:
313 can be fit into 196 0 times, resulting in a remainder of 196.
The next digit of our result is 0. 
Result so far: 2600.0
If we take 0 away from 196, we end up with 196.
Include the next digit (4) from the dividend after 196, then repeat: 1964 / 313

Let's proceed to step 7:
313 goes into 1964 6 times with a remainder of 86.
Record the quotient 6 as the next digit in the result. 
Result so far: 26006.0
Subtracting 1878 from 1964 leaves us with 86.
Grab the next digit (6) from the dividend, add it to 86, then carry on: 866 / 313

Let's proceed to step 8:
313 can be fit into 866 2 times, resulting in a remainder of 240.
The next digit of our result is 2. 
Result so far: 260062.0
If we subtract 626 from 866, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 9:
313 can be fit into 2400 7 times, resulting in a remainder of 209.
Use 7 as the next digit of our solution. 
Result so far: 260062.7
If we subtract 2191 from 2400, we get 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Going ahead to step 10:
313 goes into 2090 6 times with a remainder of 212.
Use 6 as the next digit of our solution. 
Result so far: 260062.76
If we subtract 1878 from 2090, we get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

On to step 11:
2120 divided by 313 is 6 with a remainder of 242.
Use 6 as the next digit of our solution. 
Result so far: 260062.766
If we subtract 1878 from 2120, we get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

The final outcome is 260062.766, with a leftover of 0.0242.