545437 divided by 81 
The aim is to understand the frequency of 81 in 545437.

Let's proceed to step 1:
When dividing 5 by 81, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 81

Going ahead to step 2:
81 can be fit into 54 0 times, resulting in a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 54, we end up with 54.
Include the next digit (5) from the dividend after 54, then repeat: 545 / 81

Moving on to step 3:
545 divided by 81 is 6 with a remainder of 59.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 486 from 545 and we're left with 59.
Grab the next digit (4) from the dividend, add it to 59, then carry on: 594 / 81

Advancing to step 4:
When dividing 594 by 81, we get 7 with a remainder of 27.
The next digit of our result is 7. 
Result so far: 67.0
If we subtract 567 from 594, we get 27.
Append the next digit (3) from the dividend to 27 and continue with: 273 / 81

Step 5:
81 goes into 273 3 times with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 673.0
Subtract 243 from 273 to get 30.
Fetch the next digit (7) from the dividend, attach it to 30 and continue: 307 / 81

Advancing to step 6:
When dividing 307 by 81, we get 3 with a remainder of 64.
Write down 3 as next digit of the result. 
Result so far: 6733.0
If we subtract 243 from 307, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 7:
81 can be fit into 640 7 times, resulting in a remainder of 73.
The next digit of our result is 7. 
Result so far: 6733.7
Deduct 567 from 640 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 8:
81 goes into 730 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 6733.79
If we take 729 away from 730, we end up 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 9:
10 divided by 81 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 6733.79
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.

On to step 10:
81 goes into 100 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 6733.7901
If we subtract 81 from 100, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 11:
81 goes into 190 2 times with a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 6733.79012
Subtract 162 from 190 to 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 12:
When dividing 280 by 81, we get 3 with a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 6733.790123
Deduct 243 from 280 and we're left 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.

Advancing to step 13:
81 can be fit into 370 4 times, resulting in a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 6733.7901234
Subtracting 324 from 370 leaves us 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 14:
460 divided by 81 is 5 with a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 6733.79012345
If we subtract 405 from 460, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

After the division, we end up with 6733.79012345 and a remainder of 5.5e-08.