We look at the division of 542160 by 81 
The aim is to understand the frequency of 81 in 542160.

Let's proceed to step 1:
81 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 81

Advancing to step 2:
81 goes into 54 0 times with a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Append the next digit (2) from the dividend to 54 and continue with: 542 / 81

On to step 3:
81 can be fit into 542 6 times, resulting in a remainder of 56.
The next digit of our result is 6. 
Result so far: 6.0
Deduct 486 from 542 and we're left with 56.
Fetch the next digit (1) from the dividend, attach it to 56 and continue: 561 / 81

Step 4:
If we divide 561 by 81, we get 6 and a remainder of 75.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
Deduct 486 from 561 and we're left with 75.
Bring next digit (6) of the dividend behind the 75 and repeat the process: 756 / 81

Going ahead to step 5:
81 goes into 756 9 times with a remainder of 27.
The next digit of our result is 9. 
Result so far: 669.0
The remainder is 27 after subtracting 729 from 756.
Take the next digit (0) from the dividend and append it to 27, then repeat: 270 / 81

Step 6:
81 can be fit into 270 3 times, resulting in a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 6693.0
Subtracting 243 from 270 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 7:
If we divide 270 by 81, we get 3 and a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 6693.3
Deduct 243 from 270 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 8:
270 divided by 81 is 3 with a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 6693.33
If we take 243 away from 270, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final result is 6693.33 with a remainder of 0.027.