490001 divided by 81 
The aim is to understand the frequency of 81 in 490001.

On to step 1:
When dividing 4 by 81, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 81

Step 2:
If we divide 49 by 81, we get 0 and a remainder of 49.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 49 leaves us with 49.
Bring next digit (0) of the dividend behind the 49 and repeat the process: 490 / 81

Going ahead to step 3:
490 divided by 81 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtracting 486 from 490 leaves us with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 81

Moving on to step 4:
81 goes into 40 0 times with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 60.0
The remainder is 40 after subtracting 0 from 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 81

Moving on to step 5:
When dividing 400 by 81, we get 4 with a remainder of 76.
The next digit of our result is 4. 
Result so far: 604.0
Subtracting 324 from 400 leaves us with 76.
Append the next digit (1) from the dividend to 76 and continue with: 761 / 81

Moving on to step 6:
The number 81 fits into 761 9 times, leaving a remainder of 32.
The next digit of our result is 9. 
Result so far: 6049.0
Deduct 729 from 761 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 7:
81 can be fit into 320 3 times, resulting in a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 6049.3
The remainder is 77 after subtracting 243 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 8:
770 divided by 81 is 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 6049.39
If we take 729 away from 770, we end up 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 9:
The number 81 fits into 410 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 6049.395
The remainder is 5 after subtracting 405 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
When dividing 50 by 81, we get 0 with a remainder of 50.
The next digit of our result is 0. 
Result so far: 6049.395
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.

On to step 11:
When dividing 500 by 81, we get 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 6049.39506
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.

On to step 12:
When dividing 140 by 81, we get 1 with a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 6049.395061
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 13:
The number 81 fits into 590 7 times, leaving a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 6049.3950617
Deduct 567 from 590 and we're left 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 14:
81 can be fit into 230 2 times, resulting in a remainder of 68.
Put 2 as the next digit of the answer. 
Result so far: 6049.39506172
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.

The final result is 6049.39506172 with a remainder of 6.8e-08.