We look at the division of 547616 by 81 
The aim is to understand the frequency of 81 in 547616.

Let's proceed to step 1:
5 divided by 81 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 81

Advancing 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 subtract 0 from 54, we get 54.
Bring next digit (7) of the dividend behind the 54 and repeat the process: 547 / 81

On to step 3:
81 goes into 547 6 times with a remainder of 61.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 486 from 547 leaves us with 61.
Append the next digit (6) from the dividend to 61 and continue with: 616 / 81

Moving on to step 4:
When dividing 616 by 81, we get 7 with a remainder of 49.
Use 7 as the next digit of our solution. 
Result so far: 67.0
Deduct 567 from 616 and we're left with 49.
Append the next digit (1) from the dividend to 49 and continue with: 491 / 81

Advancing to step 5:
81 goes into 491 6 times with a remainder of 5.
The next digit of our result is 6. 
Result so far: 676.0
Subtracting 486 from 491 leaves us with 5.
Bring next digit (6) of the dividend behind the 5 and repeat the process: 56 / 81

Advancing to step 6:
81 goes into 56 0 times with a remainder of 56.
Write down 0 as next digit of the result. 
Result so far: 6760.0
If we take 0 away from 56, we end up 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.

On to step 7:
If we divide 560 by 81, we get 6 and a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 6760.6
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.

Advancing to step 8:
81 can be fit into 740 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 6760.69
If we take 729 away from 740, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 9:
The number 81 fits into 110 1 times, leaving a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 6760.691
Subtract 81 from 110 to get 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 10:
When dividing 290 by 81, we get 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 6760.6913
If we subtract 243 from 290, we 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.

Going ahead to step 11:
The number 81 fits into 470 5 times, leaving a remainder of 65.
The next digit of our result is 5. 
Result so far: 6760.69135
If we subtract 405 from 470, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 12:
The number 81 fits into 650 8 times, leaving a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 6760.691358
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.

Going ahead to step 13:
81 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 6760.691358
If we take 0 away from 20, we end up 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.

Moving on to step 14:
81 goes into 200 2 times with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 6760.69135802
Deduct 162 from 200 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

After the division, we end up with 6760.69135802 and a remainder of 3.8e-08.