We're dividing 402451 by 43 
The aim is to understand the frequency of 43 in 402451.

Going ahead to step 1:
43 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 43

Step 2:
40 divided by 43 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 40, we end up with 40.
Include the next digit (2) from the dividend after 40, then repeat: 402 / 43

Let's proceed to step 3:
43 can be fit into 402 9 times, resulting in a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 387 from 402 and we're left with 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 43

Moving on to step 4:
If we divide 154 by 43, we get 3 and a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 93.0
The remainder is 25 after subtracting 129 from 154.
Append the next digit (5) from the dividend to 25 and continue with: 255 / 43

Let's proceed to step 5:
43 can be fit into 255 5 times, resulting in a remainder of 40.
The next digit of our result is 5. 
Result so far: 935.0
If we subtract 215 from 255, we get 40.
Bring next digit (1) of the dividend behind the 40 and repeat the process: 401 / 43

Moving on to step 6:
The number 43 fits into 401 9 times, leaving a remainder of 14.
Write down 9 as next digit of the result. 
Result so far: 9359.0
Deduct 387 from 401 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
If we divide 140 by 43, we get 3 and a remainder of 11.
The next digit of our result is 3. 
Result so far: 9359.3
If we subtract 129 from 140, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 8:
43 can be fit into 110 2 times, resulting in a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 9359.32
Deduct 86 from 110 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.

Advancing to step 9:
When dividing 240 by 43, we get 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 9359.325
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.

Advancing to step 10:
If we divide 250 by 43, we get 5 and a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 9359.3255
Subtracting 215 from 250 leaves us 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.

The quotient of the division is 9359.3255, and the remainder is 0.00035.