We're dividing 343971 by 54 
The aim is to understand the frequency of 54 in 343971.

Moving on to step 1:
The number 54 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 54

Going ahead to step 2:
54 goes into 34 0 times with a remainder of 34.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 34, we end up with 34.
Include the next digit (3) from the dividend after 34, then repeat: 343 / 54

Going ahead to step 3:
The number 54 fits into 343 6 times, leaving a remainder of 19.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtract 324 from 343 to get 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 54

Step 4:
When dividing 199 by 54, we get 3 with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 63.0
If we take 162 away from 199, we end up with 37.
Fetch the next digit (7) from the dividend, attach it to 37 and continue: 377 / 54

Advancing to step 5:
If we divide 377 by 54, we get 6 and a remainder of 53.
Write down 6 as next digit of the result. 
Result so far: 636.0
Subtract 324 from 377 to get 53.
Fetch the next digit (1) from the dividend, attach it to 53 and continue: 531 / 54

Step 6:
When dividing 531 by 54, we get 9 with a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 6369.0
Subtracting 486 from 531 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 7:
54 goes into 450 8 times with a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 6369.8
If we take 432 away from 450, we end up 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.

Moving on to step 8:
When dividing 180 by 54, we get 3 with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 6369.83
If we take 162 away from 180, we end up 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.

Moving on to step 9:
180 divided by 54 is 3 with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 6369.833
Deduct 162 from 180 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.

The final outcome is 6369.833, with a leftover of 0.0018.