72546400 divided by 43 
The aim is to understand the frequency of 43 in 72546400.

Step 1:
When dividing 7 by 43, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 43

On to step 2:
When dividing 72 by 43, we get 1 with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 43 from 72, we get 29.
Take the next digit (5) from the dividend and append it to 29, then repeat: 295 / 43

Advancing to step 3:
When dividing 295 by 43, we get 6 with a remainder of 37.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
The remainder is 37 after subtracting 258 from 295.
Append the next digit (4) from the dividend to 37 and continue with: 374 / 43

Moving on to step 4:
When dividing 374 by 43, we get 8 with a remainder of 30.
Write down 8 as next digit of the result. 
Result so far: 168.0
The remainder is 30 after subtracting 344 from 374.
Grab the next digit (6) from the dividend, add it to 30, then carry on: 306 / 43

Step 5:
If we divide 306 by 43, we get 7 and a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 1687.0
If we subtract 301 from 306, we get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 43

Moving on to step 6:
43 goes into 54 1 times with a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 16871.0
Subtracting 43 from 54 leaves us with 11.
Take the next digit (0) from the dividend and append it to 11, then repeat: 110 / 43

Let's proceed to step 7:
The number 43 fits into 110 2 times, leaving a remainder of 24.
The next digit of our result is 2. 
Result so far: 168712.0
Subtracting 86 from 110 leaves us with 24.
Append the next digit (0) from the dividend to 24 and continue with: 240 / 43

On to step 8:
The number 43 fits into 240 5 times, leaving a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 1687125.0
The remainder is 25 after subtracting 215 from 240.
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 9:
250 divided by 43 is 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 1687125.5
If we subtract 215 from 250, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 10:
The number 43 fits into 350 8 times, leaving a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 1687125.58
Subtract 344 from 350 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
If we divide 60 by 43, we get 1 and a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 1687125.581
If we subtract 43 from 60, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
If we divide 170 by 43, we get 3 and a remainder of 41.
Write down 3 as next digit of the result. 
Result so far: 1687125.5813
If we take 129 away from 170, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 13:
43 can be fit into 410 9 times, resulting in a remainder of 23.
Record the quotient 9 as the next digit in the result. 
Result so far: 1687125.58139
The remainder is 23 after subtracting 387 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 14:
43 goes into 230 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 1687125.581395
If we subtract 215 from 230, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 15:
43 can be fit into 150 3 times, resulting in a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 1687125.5813953
The remainder is 21 after subtracting 129 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 16:
The number 43 fits into 210 4 times, leaving a remainder of 38.
Record the quotient 4 as the next digit in the result. 
Result so far: 1687125.58139534
Deduct 172 from 210 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

The final result is 1687125.58139534 with a remainder of 3.8e-08.