We look at the division of 450435 by 9 
The aim is to understand the frequency of 9 in 450435.

Let's proceed to step 1:
If we divide 4 by 9, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 9

On to step 2:
9 can be fit into 45 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 45 away from 45, we end up with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 9

Moving on to step 3:
0 divided by 9 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
If we take 0 away from 0, we end up with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 9

Moving on to step 4:
The number 9 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 500.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 9

Step 5:
When dividing 43 by 9, we get 4 with a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 5004.0
The remainder is 7 after subtracting 36 from 43.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 9

Going ahead to step 6:
9 goes into 75 8 times with a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 50048.0
The remainder is 3 after subtracting 72 from 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
9 goes into 30 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 50048.3
If we subtract 27 from 30, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 8:
9 can be fit into 30 3 times, resulting in a remainder of 3.
The next digit of our result is 3. 
Result so far: 50048.33
If we take 27 away from 30, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final result is 50048.33 with a remainder of 0.003.