Let's divide 255409 by 43
The aim is to understand the frequency of 43 in 255409.

On to step 1:
43 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 43

Step 2:
When dividing 25 by 43, we get 0 with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Fetch the next digit (5) from the dividend, attach it to 25 and continue: 255 / 43

On to step 3:
If we divide 255 by 43, we get 5 and a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 215 from 255, we get 40.
Take the next digit (4) from the dividend and append it to 40, then repeat: 404 / 43

Step 4:
If we divide 404 by 43, we get 9 and a remainder of 17.
The next digit of our result is 9. 
Result so far: 59.0
If we subtract 387 from 404, we get 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 43

On to step 5:
If we divide 170 by 43, we get 3 and a remainder of 41.
Record the quotient 3 as the next digit in the result. 
Result so far: 593.0
The remainder is 41 after subtracting 129 from 170.
Include the next digit (9) from the dividend after 41, then repeat: 419 / 43

Going ahead to step 6:
If we divide 419 by 43, we get 9 and a remainder of 32.
Record the quotient 9 as the next digit in the result. 
Result so far: 5939.0
Deduct 387 from 419 and we're left 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.

Let's proceed to step 7:
The number 43 fits into 320 7 times, leaving a remainder of 19.
Record the quotient 7 as the next digit in the result. 
Result so far: 5939.7
If we subtract 301 from 320, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 8:
43 can be fit into 190 4 times, resulting in a remainder of 18.
Use 4 as the next digit of our solution. 
Result so far: 5939.74
The remainder is 18 after subtracting 172 from 190.
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:
When dividing 180 by 43, we get 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 5939.744
Subtracting 172 from 180 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 5939.744 and a remainder of 0.0008.