Let's divide 831426 by 81
The aim is to understand the frequency of 81 in 831426.

Advancing to step 1:
When dividing 8 by 81, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 81

Moving on to step 2:
If we divide 83 by 81, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 81 from 83 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 81

Going ahead to step 3:
When dividing 21 by 81, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 10.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (4) from the dividend, add it to 21, then carry on: 214 / 81

Step 4:
If we divide 214 by 81, we get 2 and a remainder of 52.
Write down 2 as next digit of the result. 
Result so far: 102.0
If we subtract 162 from 214, we get 52.
Bring next digit (2) of the dividend behind the 52 and repeat the process: 522 / 81

Advancing to step 5:
81 can be fit into 522 6 times, resulting in a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 1026.0
Deduct 486 from 522 and we're left with 36.
Take the next digit (6) from the dividend and append it to 36, then repeat: 366 / 81

Going ahead to step 6:
When dividing 366 by 81, we get 4 with a remainder of 42.
Use 4 as the next digit of our solution. 
Result so far: 10264.0
Deduct 324 from 366 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
81 goes into 420 5 times with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 10264.5
Subtract 405 from 420 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
81 can be fit into 150 1 times, resulting in a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 10264.51
Subtracting 81 from 150 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 9:
If we divide 690 by 81, we get 8 and a remainder of 42.
The next digit of our result is 8. 
Result so far: 10264.518
The remainder is 42 after subtracting 648 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 10:
81 can be fit into 420 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 10264.5185
Deduct 405 from 420 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 11:
150 divided by 81 is 1 with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 10264.51851
If we take 81 away from 150, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 12:
690 divided by 81 is 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 10264.518518
Subtracting 648 from 690 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 13:
81 can be fit into 420 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 10264.5185185
Subtract 405 from 420 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 14:
81 can be fit into 150 1 times, resulting in a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 10264.51851851
Deduct 81 from 150 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

The final outcome is 10264.51851851, with a leftover of 6.9e-08.