Let's divide 491578 by 81
The aim is to understand the frequency of 81 in 491578.

Step 1:
81 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 81

Step 2:
The number 81 fits into 49 0 times, leaving a remainder of 49.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 49 after subtracting 0 from 49.
Bring next digit (1) of the dividend behind the 49 and repeat the process: 491 / 81

Moving on to step 3:
81 can be fit into 491 6 times, resulting in a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 486 from 491 and we're left with 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 81

On to step 4:
The number 81 fits into 55 0 times, leaving a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 60.0
Deduct 0 from 55 and we're left with 55.
Append the next digit (7) from the dividend to 55 and continue with: 557 / 81

Moving on to step 5:
81 can be fit into 557 6 times, resulting in a remainder of 71.
Record the quotient 6 as the next digit in the result. 
Result so far: 606.0
Deduct 486 from 557 and we're left with 71.
Include the next digit (8) from the dividend after 71, then repeat: 718 / 81

Step 6:
If we divide 718 by 81, we get 8 and a remainder of 70.
Put 8 as the next digit of the answer. 
Result so far: 6068.0
Deduct 648 from 718 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 7:
If we divide 700 by 81, we get 8 and a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 6068.8
If we subtract 648 from 700, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 8:
520 divided by 81 is 6 with a remainder of 34.
The next digit of our result is 6. 
Result so far: 6068.86
The remainder is 34 after subtracting 486 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 9:
81 goes into 340 4 times with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 6068.864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 10:
160 divided by 81 is 1 with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 6068.8641
If we subtract 81 from 160, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 11:
81 can be fit into 790 9 times, resulting in a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 6068.86419
If we take 729 away from 790, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 12:
When dividing 610 by 81, we get 7 with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 6068.864197
The remainder is 43 after subtracting 567 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 13:
430 divided by 81 is 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 6068.8641975
The remainder is 25 after subtracting 405 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 14:
When dividing 250 by 81, we get 3 with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 6068.86419753
If we subtract 243 from 250, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 6068.86419753 with a remainder of 7e-09.