12412 divided by 81 
The aim is to understand the frequency of 81 in 12412.

Let's proceed to step 1:
When dividing 1 by 81, we get 0 with 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 (2) from the dividend, attach it to 1 and continue: 12 / 81

Moving on to step 2:
When dividing 12 by 81, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 81

Let's proceed to step 3:
81 can be fit into 124 1 times, resulting in a remainder of 43.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 81 from 124 and we're left with 43.
Append the next digit (1) from the dividend to 43 and continue with: 431 / 81

Advancing to step 4:
431 divided by 81 is 5 with a remainder of 26.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtracting 405 from 431 leaves us with 26.
Bring next digit (2) of the dividend behind the 26 and repeat the process: 262 / 81

Moving on to step 5:
When dividing 262 by 81, we get 3 with a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 153.0
If we subtract 243 from 262, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 6:
81 goes into 190 2 times with a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 153.2
The remainder is 28 after subtracting 162 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 7:
When dividing 280 by 81, we get 3 with a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 153.23
Subtract 243 from 280 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 8:
81 goes into 370 4 times with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 153.234
Deduct 324 from 370 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 9:
When dividing 460 by 81, we get 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 153.2345
Subtract 405 from 460 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 10:
The number 81 fits into 550 6 times, leaving a remainder of 64.
The next digit of our result is 6. 
Result so far: 153.23456
If we take 486 away from 550, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 11:
When dividing 640 by 81, we get 7 with a remainder of 73.
Record the quotient 7 as the next digit in the result. 
Result so far: 153.234567
If we take 567 away from 640, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 12:
The number 81 fits into 730 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 153.2345679
If we take 729 away from 730, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
81 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 153.2345679
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 153.2345679, with a leftover of 1e-08.