We're dividing 591966 by 81 
The aim is to understand the frequency of 81 in 591966.

Moving on to step 1:
The number 81 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 81

Going ahead to step 2:
If we divide 59 by 81, we get 0 and a remainder of 59.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 59 and we're left with 59.
Grab the next digit (1) from the dividend, add it to 59, then carry on: 591 / 81

Step 3:
If we divide 591 by 81, we get 7 and a remainder of 24.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 567 from 591 leaves us with 24.
Grab the next digit (9) from the dividend, add it to 24, then carry on: 249 / 81

Advancing to step 4:
When dividing 249 by 81, we get 3 with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 73.0
If we subtract 243 from 249, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 81

Moving on to step 5:
The number 81 fits into 66 0 times, leaving a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 730.0
The remainder is 66 after subtracting 0 from 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 81

Moving on to step 6:
When dividing 666 by 81, we get 8 with a remainder of 18.
The number 8 becomes the next digit in our result. 
Result so far: 7308.0
The remainder is 18 after subtracting 648 from 666.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 7:
81 goes into 180 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 7308.2
If we take 162 away from 180, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 8:
180 divided by 81 is 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 7308.22
The remainder is 18 after subtracting 162 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

In conclusion, the division gives 7308.22 with a balance of 0.018.