668495 divided by 9 
The aim is to understand the frequency of 9 in 668495.

On to step 1:
9 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 9

Step 2:
9 can be fit into 66 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 63 away from 66, we end up with 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 9

Moving on to step 3:
9 can be fit into 38 4 times, resulting in a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 74.0
If we take 36 away from 38, we end up with 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 9

Moving on to step 4:
If we divide 24 by 9, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 742.0
Subtracting 18 from 24 leaves us with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 9

Step 5:
9 can be fit into 69 7 times, resulting in a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 7427.0
If we subtract 63 from 69, we get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 9

On to step 6:
When dividing 65 by 9, we get 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 74277.0
Subtracting 63 from 65 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
9 goes into 20 2 times with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 74277.2
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
9 can be fit into 20 2 times, resulting in a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 74277.22
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 74277.22 with a remainder of 0.002.