We're dividing 354934 by 81 
The aim is to understand the frequency of 81 in 354934.

Moving on to step 1:
When dividing 3 by 81, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 81

Step 2:
The number 81 fits into 35 0 times, leaving a remainder of 35.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 35, we end up with 35.
Include the next digit (4) from the dividend after 35, then repeat: 354 / 81

Step 3:
The number 81 fits into 354 4 times, leaving a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 324 from 354, we get 30.
Fetch the next digit (9) from the dividend, attach it to 30 and continue: 309 / 81

Advancing to step 4:
81 goes into 309 3 times with a remainder of 66.
The next digit of our result is 3. 
Result so far: 43.0
The remainder is 66 after subtracting 243 from 309.
Take the next digit (3) from the dividend and append it to 66, then repeat: 663 / 81

Let's proceed to step 5:
If we divide 663 by 81, we get 8 and a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 438.0
If we subtract 648 from 663, we get 15.
Append the next digit (4) from the dividend to 15 and continue with: 154 / 81

Step 6:
When dividing 154 by 81, we get 1 with a remainder of 73.
Record the quotient 1 as the next digit in the result. 
Result so far: 4381.0
If we subtract 81 from 154, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 7:
The number 81 fits into 730 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 4381.9
Subtracting 729 from 730 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 8:
When dividing 10 by 81, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 4381.9
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
81 can be fit into 100 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 4381.901
The remainder is 19 after subtracting 81 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 10:
81 goes into 190 2 times with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 4381.9012
If we subtract 162 from 190, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 11:
280 divided by 81 is 3 with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 4381.90123
If we take 243 away from 280, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 12:
81 goes into 370 4 times with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 4381.901234
If we take 324 away from 370, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 13:
81 goes into 460 5 times with a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 4381.9012345
Subtracting 405 from 460 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 14:
81 can be fit into 550 6 times, resulting in a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 4381.90123456
Subtracting 486 from 550 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

After the division, we end up with 4381.90123456 and a remainder of 6.4e-08.