We look at the division of 648558 by 43 
The aim is to understand the frequency of 43 in 648558.

Step 1:
The number 43 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 43

Moving on to step 2:
43 goes into 64 1 times with a remainder of 21.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 43 from 64 leaves us with 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 43

Going ahead to step 3:
218 divided by 43 is 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 215 away from 218, we end up with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 43

Let's proceed to step 4:
43 goes into 35 0 times with a remainder of 35.
The next digit of our result is 0. 
Result so far: 150.0
Subtracting 0 from 35 leaves us with 35.
Fetch the next digit (5) from the dividend, attach it to 35 and continue: 355 / 43

Let's proceed to step 5:
355 divided by 43 is 8 with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 1508.0
If we subtract 344 from 355, we get 11.
Fetch the next digit (8) from the dividend, attach it to 11 and continue: 118 / 43

Advancing to step 6:
43 goes into 118 2 times with a remainder of 32.
The number 2 becomes the next digit in our result. 
Result so far: 15082.0
If we subtract 86 from 118, we 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.

Step 7:
320 divided by 43 is 7 with a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 15082.7
The remainder is 19 after subtracting 301 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
43 goes into 190 4 times with a remainder of 18.
The next digit of our result is 4. 
Result so far: 15082.74
Subtracting 172 from 190 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.

Let's proceed to step 9:
180 divided by 43 is 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 15082.744
The remainder is 8 after subtracting 172 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The quotient of the division is 15082.744, and the remainder is 0.0008.