We're dividing 163341 by 81 
The aim is to understand the frequency of 81 in 163341.

Advancing to step 1:
1 divided by 81 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 81

On to step 2:
The number 81 fits into 16 0 times, leaving a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Bring next digit (3) of the dividend behind the 16 and repeat the process: 163 / 81

Let's proceed to step 3:
The number 81 fits into 163 2 times, leaving a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 1 after subtracting 162 from 163.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 81

Going ahead to step 4:
If we divide 13 by 81, we get 0 and a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we take 0 away from 13, we end up with 13.
Bring next digit (4) of the dividend behind the 13 and repeat the process: 134 / 81

On to step 5:
The number 81 fits into 134 1 times, leaving a remainder of 53.
The number 1 becomes the next digit in our result. 
Result so far: 201.0
If we subtract 81 from 134, we get 53.
Bring next digit (1) of the dividend behind the 53 and repeat the process: 531 / 81

Moving on to step 6:
When dividing 531 by 81, we get 6 with a remainder of 45.
The next digit of our result is 6. 
Result so far: 2016.0
The remainder is 45 after subtracting 486 from 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 7:
450 divided by 81 is 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 2016.5
Deduct 405 from 450 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 8:
450 divided by 81 is 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 2016.55
If we take 405 away from 450, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Our division results in 2016.55 with a remaining 0.045.