We look at the division of 349284 by 81 
The aim is to understand the frequency of 81 in 349284.

On to step 1:
The number 81 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 81

On to step 2:
When dividing 34 by 81, we get 0 with a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 34 after subtracting 0 from 34.
Bring next digit (9) of the dividend behind the 34 and repeat the process: 349 / 81

Advancing to step 3:
81 goes into 349 4 times with a remainder of 25.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 324 from 349 leaves us with 25.
Append the next digit (2) from the dividend to 25 and continue with: 252 / 81

Going ahead to step 4:
When dividing 252 by 81, we get 3 with a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 43.0
Subtracting 243 from 252 leaves us with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 81

On to step 5:
81 goes into 98 1 times with a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 431.0
The remainder is 17 after subtracting 81 from 98.
Fetch the next digit (4) from the dividend, attach it to 17 and continue: 174 / 81

On to step 6:
If we divide 174 by 81, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 4312.0
Subtracting 162 from 174 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
81 goes into 120 1 times with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 4312.1
If we take 81 away from 120, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 8:
81 goes into 390 4 times with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 4312.14
Subtract 324 from 390 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 9:
The number 81 fits into 660 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 4312.148
Deduct 648 from 660 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
When dividing 120 by 81, we get 1 with a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 4312.1481
The remainder is 39 after subtracting 81 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 11:
81 can be fit into 390 4 times, resulting in a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 4312.14814
Subtract 324 from 390 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 12:
660 divided by 81 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 4312.148148
If we subtract 648 from 660, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 13:
The number 81 fits into 120 1 times, leaving a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 4312.1481481
Deduct 81 from 120 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 14:
If we divide 390 by 81, we get 4 and a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 4312.14814814
If we subtract 324 from 390, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final outcome is 4312.14814814, with a leftover of 6.6e-08.