We look at the division of 869310 by 54 
The aim is to understand the frequency of 54 in 869310.

Step 1:
If we divide 8 by 54, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 54

On to step 2:
54 can be fit into 86 1 times, resulting in a remainder of 32.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 54 from 86 to get 32.
Include the next digit (9) from the dividend after 32, then repeat: 329 / 54

Going ahead to step 3:
329 divided by 54 is 6 with a remainder of 5.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 324 from 329 to get 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 54

Advancing to step 4:
53 divided by 54 is 0 with a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 160.0
Deduct 0 from 53 and we're left with 53.
Include the next digit (1) from the dividend after 53, then repeat: 531 / 54

On to step 5:
If we divide 531 by 54, we get 9 and a remainder of 45.
The next digit of our result is 9. 
Result so far: 1609.0
If we take 486 away from 531, we end up with 45.
Take the next digit (0) from the dividend and append it to 45, then repeat: 450 / 54

Step 6:
When dividing 450 by 54, we get 8 with a remainder of 18.
Write down 8 as next digit of the result. 
Result so far: 16098.0
Deduct 432 from 450 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
54 goes into 180 3 times with a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 16098.3
The remainder is 18 after subtracting 162 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
If we divide 180 by 54, we get 3 and a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 16098.33
Subtracting 162 from 180 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 16098.33, and the remainder is 0.018.