363143 ÷ 81 
The aim is to understand the frequency of 81 in 363143.

Moving on to step 1:
81 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 81

Advancing to step 2:
If we divide 36 by 81, we get 0 and a remainder of 36.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 36 leaves us with 36.
Fetch the next digit (3) from the dividend, attach it to 36 and continue: 363 / 81

Moving on to step 3:
When dividing 363 by 81, we get 4 with a remainder of 39.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 324 from 363 leaves us with 39.
Include the next digit (1) from the dividend after 39, then repeat: 391 / 81

Going ahead to step 4:
391 divided by 81 is 4 with a remainder of 67.
Write down 4 as next digit of the result. 
Result so far: 44.0
Deduct 324 from 391 and we're left with 67.
Bring next digit (4) of the dividend behind the 67 and repeat the process: 674 / 81

On to step 5:
When dividing 674 by 81, we get 8 with a remainder of 26.
Put 8 as the next digit of the answer. 
Result so far: 448.0
Subtract 648 from 674 to get 26.
Fetch the next digit (3) from the dividend, attach it to 26 and continue: 263 / 81

Moving on to step 6:
If we divide 263 by 81, we get 3 and a remainder of 20.
The next digit of our result is 3. 
Result so far: 4483.0
If we take 243 away from 263, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
200 divided by 81 is 2 with a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 4483.2
Deduct 162 from 200 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 8:
The number 81 fits into 380 4 times, leaving a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 4483.24
If we take 324 away from 380, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 9:
560 divided by 81 is 6 with a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 4483.246
Subtracting 486 from 560 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 10:
When dividing 740 by 81, we get 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 4483.2469
Deduct 729 from 740 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 11:
110 divided by 81 is 1 with a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 4483.24691
If we take 81 away from 110, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 12:
The number 81 fits into 290 3 times, leaving a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 4483.246913
If we subtract 243 from 290, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 13:
81 goes into 470 5 times with a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 4483.2469135
If we take 405 away from 470, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 14:
81 goes into 650 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 4483.24691358
The remainder is 2 after subtracting 648 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 4483.24691358, with a leftover of 2e-09.