644379 ÷ 43 
The aim is to understand the frequency of 43 in 644379.

Advancing to 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
Subtracting 0 from 6 leaves us with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 43

Let's proceed to step 2:
43 goes into 64 1 times with a remainder of 21.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 43 from 64 to get 21.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 43

On to step 3:
214 divided by 43 is 4 with a remainder of 42.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Deduct 172 from 214 and we're left with 42.
Fetch the next digit (3) from the dividend, attach it to 42 and continue: 423 / 43

Going ahead to step 4:
If we divide 423 by 43, we get 9 and a remainder of 36.
Put 9 as the next digit of the answer. 
Result so far: 149.0
The remainder is 36 after subtracting 387 from 423.
Fetch the next digit (7) from the dividend, attach it to 36 and continue: 367 / 43

Advancing to step 5:
43 goes into 367 8 times with a remainder of 23.
Record the quotient 8 as the next digit in the result. 
Result so far: 1498.0
Deduct 344 from 367 and we're left with 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 43

Going ahead to step 6:
43 goes into 239 5 times with a remainder of 24.
The number 5 becomes the next digit in our result. 
Result so far: 14985.0
Deduct 215 from 239 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
The number 43 fits into 240 5 times, leaving a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 14985.5
Deduct 215 from 240 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 8:
43 can be fit into 250 5 times, resulting in a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 14985.55
Deduct 215 from 250 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

After the division, we end up with 14985.55 and a remainder of 0.035.