835251 ÷ 81 
The aim is to understand the frequency of 81 in 835251.

Advancing to step 1:
The number 81 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 81

On to step 2:
The number 81 fits into 83 1 times, leaving a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 81 from 83, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 81

Going ahead to step 3:
The number 81 fits into 25 0 times, leaving a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtracting 0 from 25 leaves us with 25.
Bring next digit (2) of the dividend behind the 25 and repeat the process: 252 / 81

Going ahead to step 4:
252 divided by 81 is 3 with a remainder of 9.
The next digit of our result is 3. 
Result so far: 103.0
Deduct 243 from 252 and we're left with 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 81

Advancing to step 5:
If we divide 95 by 81, we get 1 and a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 1031.0
If we take 81 away from 95, we end up with 14.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 81

Step 6:
When dividing 141 by 81, we get 1 with a remainder of 60.
The next digit of our result is 1. 
Result so far: 10311.0
Subtract 81 from 141 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 7:
81 can be fit into 600 7 times, resulting in a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 10311.7
The remainder is 33 after subtracting 567 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 8:
The number 81 fits into 330 4 times, leaving a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 10311.74
If we subtract 324 from 330, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 9:
If we divide 60 by 81, we get 0 and a remainder of 60.
The next digit of our result is 0. 
Result so far: 10311.74
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 10:
81 goes into 600 7 times with a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 10311.7407
If we subtract 567 from 600, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 11:
The number 81 fits into 330 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 10311.74074
If we subtract 324 from 330, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
The number 81 fits into 60 0 times, leaving a remainder of 60.
The next digit of our result is 0. 
Result so far: 10311.74074
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 13:
600 divided by 81 is 7 with a remainder of 33.
The number 7 becomes the next digit in our result. 
Result so far: 10311.7407407
The remainder is 33 after subtracting 567 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 14:
81 goes into 330 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 10311.74074074
Subtract 324 from 330 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 10311.74074074 with a balance of 6e-09.