We're dividing 423457 by 9 
The aim is to understand the frequency of 9 in 423457.

Let's proceed to step 1:
9 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 9

Moving on to step 2:
If we divide 42 by 9, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 6 after subtracting 36 from 42.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 9

On to step 3:
The number 9 fits into 63 7 times, leaving a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 47.0
If we subtract 63 from 63, we get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 9

Going ahead to step 4:
The number 9 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 470.0
If we subtract 0 from 4, we get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 9

Moving on to step 5:
9 goes into 45 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 4705.0
Deduct 45 from 45 and we're left with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 9

Step 6:
9 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 47050.0
Subtract 0 from 7 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
The number 9 fits into 70 7 times, leaving a remainder of 7.
The next digit of our result is 7. 
Result so far: 47050.7
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
70 divided by 9 is 7 with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 47050.77
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 47050.77 with a remainder of 0.007.