We look at the division of 903429 by 43 
The aim is to understand the frequency of 43 in 903429.

Going ahead to step 1:
9 divided by 43 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 43

Let's proceed to step 2:
43 goes into 90 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 4 after subtracting 86 from 90.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 43

On to step 3:
When dividing 43 by 43, we get 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Deduct 43 from 43 and we're left with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 43

Step 4:
43 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 210.0
If we take 0 away from 4, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 43

Let's proceed to step 5:
The number 43 fits into 42 0 times, leaving a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 2100.0
Subtracting 0 from 42 leaves us with 42.
Bring next digit (9) of the dividend behind the 42 and repeat the process: 429 / 43

On to step 6:
The number 43 fits into 429 9 times, leaving a remainder of 42.
Write down 9 as next digit of the result. 
Result so far: 21009.0
If we take 387 away from 429, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
43 can be fit into 420 9 times, resulting in a remainder of 33.
Use 9 as the next digit of our solution. 
Result so far: 21009.9
Deduct 387 from 420 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 8:
330 divided by 43 is 7 with a remainder of 29.
Write down 7 as next digit of the result. 
Result so far: 21009.97
Subtracting 301 from 330 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 9:
If we divide 290 by 43, we get 6 and a remainder of 32.
The number 6 becomes the next digit in our result. 
Result so far: 21009.976
If we subtract 258 from 290, 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 10:
43 goes into 320 7 times with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 21009.9767
Subtracting 301 from 320 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 11:
190 divided by 43 is 4 with a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 21009.97674
If we take 172 away from 190, we end up 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.

Advancing to step 12:
43 goes into 180 4 times with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 21009.976744
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.

The quotient of the division is 21009.976744, and the remainder is 8e-07.