We divide 623309 by 9
The aim is to understand the frequency of 9 in 623309.

Moving on to step 1:
When dividing 6 by 9, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 9

Moving on to step 2:
The number 9 fits into 62 6 times, leaving a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 54 from 62 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 9

On to step 3:
If we divide 83 by 9, we get 9 and a remainder of 2.
The next digit of our result is 9. 
Result so far: 69.0
If we take 81 away from 83, we end up with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 9

Advancing to step 4:
When dividing 23 by 9, we get 2 with a remainder of 5.
The next digit of our result is 2. 
Result so far: 692.0
If we take 18 away from 23, we end up with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 9

Moving on to step 5:
50 divided by 9 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 6925.0
Subtract 45 from 50 to get 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 9

Step 6:
The number 9 fits into 59 6 times, leaving a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 69256.0
If we subtract 54 from 59, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
9 can be fit into 50 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 69256.5
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
9 goes into 50 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 69256.55
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 69256.55, with a leftover of 0.005.