Let's divide 66461 by 81
The aim is to understand the frequency of 81 in 66461.

On to step 1:
6 divided by 81 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 81

Advancing to step 2:
If we divide 66 by 81, we get 0 and a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (4) from the dividend after 66, then repeat: 664 / 81

Advancing to step 3:
81 goes into 664 8 times with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 648 away from 664, we end up with 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 81

Step 4:
The number 81 fits into 166 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 82.0
If we subtract 162 from 166, we get 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 81

Moving on to step 5:
81 goes into 41 0 times with a remainder of 41.
The number 0 becomes the next digit in our result. 
Result so far: 820.0
Deduct 0 from 41 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 6:
When dividing 410 by 81, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 820.5
Deduct 405 from 410 and we're left 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:
The number 81 fits into 50 0 times, leaving a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 820.5
If we subtract 0 from 50, we 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.

Let's proceed to step 8:
If we divide 500 by 81, we get 6 and a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 820.506
The remainder is 14 after subtracting 486 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 9:
81 can be fit into 140 1 times, resulting in a remainder of 59.
Record the quotient 1 as the next digit in the result. 
Result so far: 820.5061
If we take 81 away from 140, we end up 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.

On to step 10:
If we divide 590 by 81, we get 7 and a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 820.50617
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.

On to step 11:
230 divided by 81 is 2 with a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 820.506172
Subtracting 162 from 230 leaves us 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.

Step 12:
If we divide 680 by 81, we get 8 and a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 820.5061728
Subtract 648 from 680 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 13:
81 can be fit into 320 3 times, resulting in a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 820.50617283
Subtract 243 from 320 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

The final outcome is 820.50617283, with a leftover of 7.7e-08.