We look at the division of 516135 by 54 
The aim is to understand the frequency of 54 in 516135.

Going ahead to step 1:
5 divided by 54 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 54

Let's proceed to step 2:
When dividing 51 by 54, we get 0 with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Grab the next digit (6) from the dividend, add it to 51, then carry on: 516 / 54

On to step 3:
54 can be fit into 516 9 times, resulting in a remainder of 30.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 486 from 516 leaves us with 30.
Bring next digit (1) of the dividend behind the 30 and repeat the process: 301 / 54

Step 4:
301 divided by 54 is 5 with a remainder of 31.
The next digit of our result is 5. 
Result so far: 95.0
Subtracting 270 from 301 leaves us with 31.
Grab the next digit (3) from the dividend, add it to 31, then carry on: 313 / 54

Moving on to step 5:
54 can be fit into 313 5 times, resulting in a remainder of 43.
The number 5 becomes the next digit in our result. 
Result so far: 955.0
The remainder is 43 after subtracting 270 from 313.
Bring next digit (5) of the dividend behind the 43 and repeat the process: 435 / 54

Step 6:
54 goes into 435 8 times with a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 9558.0
If we subtract 432 from 435, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
If we divide 30 by 54, we get 0 and a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 9558.0
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
54 can be fit into 300 5 times, resulting in a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 9558.05
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 9:
When dividing 300 by 54, we get 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 9558.055
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 9558.055 with a remainder of 0.003.