We're dividing 641658 by 54 
The aim is to understand the frequency of 54 in 641658.

On to step 1:
54 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 54

Going ahead to step 2:
54 can be fit into 64 1 times, resulting in a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 54 from 64 leaves us with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 54

Step 3:
101 divided by 54 is 1 with a remainder of 47.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 54 from 101, we get 47.
Grab the next digit (6) from the dividend, add it to 47, then carry on: 476 / 54

Moving on to step 4:
If we divide 476 by 54, we get 8 and a remainder of 44.
The next digit of our result is 8. 
Result so far: 118.0
Subtract 432 from 476 to get 44.
Bring next digit (5) of the dividend behind the 44 and repeat the process: 445 / 54

Advancing to step 5:
The number 54 fits into 445 8 times, leaving a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 1188.0
Deduct 432 from 445 and we're left with 13.
Include the next digit (8) from the dividend after 13, then repeat: 138 / 54

Going ahead to step 6:
138 divided by 54 is 2 with a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 11882.0
Deduct 108 from 138 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 7:
300 divided by 54 is 5 with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 11882.5
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.

Going ahead to step 8:
300 divided by 54 is 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 11882.55
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.

The final result is 11882.55 with a remainder of 0.03.