Let's divide 198665 by 81
The aim is to understand the frequency of 81 in 198665.

On to step 1:
If we divide 1 by 81, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 81

Let's proceed to step 2:
The number 81 fits into 19 0 times, leaving a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 19, we end up with 19.
Fetch the next digit (8) from the dividend, attach it to 19 and continue: 198 / 81

Let's proceed to step 3:
81 can be fit into 198 2 times, resulting in a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 162 from 198 leaves us with 36.
Include the next digit (6) from the dividend after 36, then repeat: 366 / 81

Advancing to step 4:
If we divide 366 by 81, we get 4 and a remainder of 42.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Subtract 324 from 366 to get 42.
Grab the next digit (6) from the dividend, add it to 42, then carry on: 426 / 81

On to step 5:
81 goes into 426 5 times with a remainder of 21.
The next digit of our result is 5. 
Result so far: 245.0
Deduct 405 from 426 and we're left with 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 81

Moving on to step 6:
215 divided by 81 is 2 with a remainder of 53.
Record the quotient 2 as the next digit in the result. 
Result so far: 2452.0
If we take 162 away from 215, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 7:
530 divided by 81 is 6 with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 2452.6
Subtracting 486 from 530 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 8:
440 divided by 81 is 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 2452.65
If we subtract 405 from 440, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 9:
If we divide 350 by 81, we get 4 and a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 2452.654
If we take 324 away from 350, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 10:
If we divide 260 by 81, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 2452.6543
The remainder is 17 after subtracting 243 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 11:
If we divide 170 by 81, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 2452.65432
If we take 162 away from 170, we end up 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.

On to step 12:
When dividing 80 by 81, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 2452.65432
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.

Moving on to step 13:
81 can be fit into 800 9 times, resulting in a remainder of 71.
Put 9 as the next digit of the answer. 
Result so far: 2452.6543209
Subtract 729 from 800 to 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.

Advancing to step 14:
81 can be fit into 710 8 times, resulting in a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 2452.65432098
Subtract 648 from 710 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

After the division, we end up with 2452.65432098 and a remainder of 6.2e-08.