We look at the division of 330875 by 81 
The aim is to understand the frequency of 81 in 330875.

Going ahead to step 1:
3 divided by 81 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 81

Step 2:
33 divided by 81 is 0 with a remainder of 33.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 33 leaves us with 33.
Fetch the next digit (0) from the dividend, attach it to 33 and continue: 330 / 81

Step 3:
330 divided by 81 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 6 after subtracting 324 from 330.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 81

Advancing to step 4:
The number 81 fits into 68 0 times, leaving a remainder of 68.
Write down 0 as next digit of the result. 
Result so far: 40.0
Subtract 0 from 68 to get 68.
Bring next digit (7) of the dividend behind the 68 and repeat the process: 687 / 81

Going ahead to step 5:
81 can be fit into 687 8 times, resulting in a remainder of 39.
The number 8 becomes the next digit in our result. 
Result so far: 408.0
If we subtract 648 from 687, we get 39.
Append the next digit (5) from the dividend to 39 and continue with: 395 / 81

Advancing to step 6:
81 goes into 395 4 times with a remainder of 71.
Put 4 as the next digit of the answer. 
Result so far: 4084.0
If we subtract 324 from 395, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 7:
81 can be fit into 710 8 times, resulting in a remainder of 62.
Put 8 as the next digit of the answer. 
Result so far: 4084.8
Deduct 648 from 710 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 8:
If we divide 620 by 81, we get 7 and a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 4084.87
Subtract 567 from 620 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

On to step 9:
81 can be fit into 530 6 times, resulting in a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 4084.876
The remainder is 44 after subtracting 486 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 10:
81 can be fit into 440 5 times, resulting in a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 4084.8765
Deduct 405 from 440 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 11:
When dividing 350 by 81, we get 4 with a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 4084.87654
If we subtract 324 from 350, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 12:
81 can be fit into 260 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 4084.876543
If we subtract 243 from 260, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 13:
81 goes into 170 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 4084.8765432
Subtracting 162 from 170 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
81 goes into 80 0 times with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 4084.8765432
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

In conclusion, the division gives 4084.8765432 with a balance of 8e-08.