831554 divided by 81 
The aim is to understand the frequency of 81 in 831554.

Going ahead 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
If we take 0 away from 8, we end up with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 81

Advancing to step 2:
If we divide 83 by 81, we get 1 and a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 81 away from 83, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 81

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
Subtract 0 from 21 to get 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 81

On to step 4:
If we divide 215 by 81, we get 2 and a remainder of 53.
The number 2 becomes the next digit in our result. 
Result so far: 102.0
Subtracting 162 from 215 leaves us with 53.
Fetch the next digit (5) from the dividend, attach it to 53 and continue: 535 / 81

Advancing to step 5:
The number 81 fits into 535 6 times, leaving a remainder of 49.
Put 6 as the next digit of the answer. 
Result so far: 1026.0
Subtracting 486 from 535 leaves us with 49.
Include the next digit (4) from the dividend after 49, then repeat: 494 / 81

Step 6:
81 can be fit into 494 6 times, resulting in a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 10266.0
Subtracting 486 from 494 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
81 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 10266.0
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 8:
81 goes into 800 9 times with a remainder of 71.
The next digit of our result is 9. 
Result so far: 10266.09
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 9:
81 can be fit into 710 8 times, resulting in a remainder of 62.
The number 8 becomes the next digit in our result. 
Result so far: 10266.098
If we take 648 away from 710, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 10:
620 divided by 81 is 7 with a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 10266.0987
If we take 567 away from 620, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 11:
81 goes into 530 6 times with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 10266.09876
Deduct 486 from 530 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 12:
When dividing 440 by 81, we get 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 10266.098765
Subtracting 405 from 440 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 13:
350 divided by 81 is 4 with a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 10266.0987654
Subtract 324 from 350 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 14:
260 divided by 81 is 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 10266.09876543
If we take 243 away from 260, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 10266.09876543 with a remaining 1.7e-08.