We look at the division of 189950 by 81 
The aim is to understand the frequency of 81 in 189950.

Moving on to step 1:
81 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 81

On to step 2:
When dividing 18 by 81, we get 0 with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Fetch the next digit (9) from the dividend, attach it to 18 and continue: 189 / 81

Going ahead to step 3:
189 divided by 81 is 2 with a remainder of 27.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 162 from 189, we get 27.
Include the next digit (9) from the dividend after 27, then repeat: 279 / 81

Going ahead to step 4:
81 can be fit into 279 3 times, resulting in a remainder of 36.
The next digit of our result is 3. 
Result so far: 23.0
Subtracting 243 from 279 leaves us with 36.
Include the next digit (5) from the dividend after 36, then repeat: 365 / 81

Step 5:
81 can be fit into 365 4 times, resulting in a remainder of 41.
Record the quotient 4 as the next digit in the result. 
Result so far: 234.0
The remainder is 41 after subtracting 324 from 365.
Grab the next digit (0) from the dividend, add it to 41, then carry on: 410 / 81

Advancing to step 6:
410 divided by 81 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 2345.0
Subtracting 405 from 410 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.

Moving on to step 7:
If we divide 50 by 81, we get 0 and a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 2345.0
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 8:
When dividing 500 by 81, we get 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 2345.06
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 9:
81 goes into 140 1 times with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 2345.061
Deduct 81 from 140 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 10:
When dividing 590 by 81, we get 7 with a remainder of 23.
The next digit of our result is 7. 
Result so far: 2345.0617
If we take 567 away from 590, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 11:
If we divide 230 by 81, we get 2 and a remainder of 68.
The number 2 becomes the next digit in our result. 
Result so far: 2345.06172
If we take 162 away from 230, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 12:
81 goes into 680 8 times with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 2345.061728
Subtracting 648 from 680 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 13:
The number 81 fits into 320 3 times, leaving a remainder of 77.
Write down 3 as next digit of the result. 
Result so far: 2345.0617283
Subtracting 243 from 320 leaves us with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 14:
The number 81 fits into 770 9 times, leaving a remainder of 41.
The next digit of our result is 9. 
Result so far: 2345.06172839
If we subtract 729 from 770, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

The final outcome is 2345.06172839, with a leftover of 4.1e-08.