We look at the division of 125645 by 54 
The aim is to understand the frequency of 54 in 125645.

Advancing to step 1:
1 divided by 54 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 54

Advancing to step 2:
54 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 54

Moving on to step 3:
125 divided by 54 is 2 with a remainder of 17.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 108 from 125 leaves us with 17.
Append the next digit (6) from the dividend to 17 and continue with: 176 / 54

Let's proceed to step 4:
176 divided by 54 is 3 with a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 23.0
Subtract 162 from 176 to get 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 54

Advancing to step 5:
54 goes into 144 2 times with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 232.0
Subtract 108 from 144 to get 36.
Include the next digit (5) from the dividend after 36, then repeat: 365 / 54

Going ahead to step 6:
The number 54 fits into 365 6 times, leaving a remainder of 41.
The number 6 becomes the next digit in our result. 
Result so far: 2326.0
Deduct 324 from 365 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 7:
54 goes into 410 7 times with a remainder of 32.
Use 7 as the next digit of our solution. 
Result so far: 2326.7
Subtract 378 from 410 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 8:
320 divided by 54 is 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 2326.75
Subtracting 270 from 320 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
54 can be fit into 500 9 times, resulting in a remainder of 14.
Write down 9 as next digit of the result. 
Result so far: 2326.759
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 10:
54 can be fit into 140 2 times, resulting in a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 2326.7592
If we take 108 away from 140, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 11:
320 divided by 54 is 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 2326.75925
Deduct 270 from 320 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 12:
54 can be fit into 500 9 times, resulting in a remainder of 14.
Write down 9 as next digit of the result. 
Result so far: 2326.759259
Deduct 486 from 500 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 13:
If we divide 140 by 54, we get 2 and a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 2326.7592592
The remainder is 32 after subtracting 108 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 14:
54 can be fit into 320 5 times, resulting in a remainder of 50.
The next digit of our result is 5. 
Result so far: 2326.75925925
Subtract 270 from 320 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final outcome is 2326.75925925, with a leftover of 5e-08.