We look at the division of 290207 by 81 
The aim is to understand the frequency of 81 in 290207.

Moving on to step 1:
2 divided by 81 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 81

Advancing to step 2:
The number 81 fits into 29 0 times, leaving a remainder of 29.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 29, we end up with 29.
Include the next digit (0) from the dividend after 29, then repeat: 290 / 81

Going ahead to step 3:
290 divided by 81 is 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 243 away from 290, we end up with 47.
Include the next digit (2) from the dividend after 47, then repeat: 472 / 81

Let's proceed to step 4:
If we divide 472 by 81, we get 5 and a remainder of 67.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Deduct 405 from 472 and we're left with 67.
Append the next digit (0) from the dividend to 67 and continue with: 670 / 81

Let's proceed to step 5:
When dividing 670 by 81, we get 8 with a remainder of 22.
Use 8 as the next digit of our solution. 
Result so far: 358.0
The remainder is 22 after subtracting 648 from 670.
Append the next digit (7) from the dividend to 22 and continue with: 227 / 81

On to step 6:
When dividing 227 by 81, we get 2 with a remainder of 65.
Put 2 as the next digit of the answer. 
Result so far: 3582.0
Deduct 162 from 227 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 7:
81 can be fit into 650 8 times, resulting in a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 3582.8
Subtract 648 from 650 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
20 divided by 81 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 3582.8
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
When dividing 200 by 81, we get 2 with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 3582.802
The remainder is 38 after subtracting 162 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
380 divided by 81 is 4 with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 3582.8024
Subtracting 324 from 380 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 11:
560 divided by 81 is 6 with a remainder of 74.
The next digit of our result is 6. 
Result so far: 3582.80246
The remainder is 74 after subtracting 486 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 12:
81 goes into 740 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 3582.802469
If we subtract 729 from 740, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
81 goes into 110 1 times with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 3582.8024691
Deduct 81 from 110 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 14:
When dividing 290 by 81, we get 3 with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 3582.80246913
Subtract 243 from 290 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final outcome is 3582.80246913, with a leftover of 4.7e-08.