We look at the division of 634415 by 9 
The aim is to understand the frequency of 9 in 634415.

Going ahead to step 1:
6 divided by 9 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 9

Moving on to step 2:
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: 7.0
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

On to step 3:
9 can be fit into 4 0 times, resulting in a remainder of 4.
The next digit of our result is 0. 
Result so far: 70.0
If we take 0 away from 4, we end up with 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 9

Going ahead to step 4:
If we divide 44 by 9, we get 4 and a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 704.0
The remainder is 8 after subtracting 36 from 44.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 9

Going ahead to step 5:
9 goes into 81 9 times with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 7049.0
If we subtract 81 from 81, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 9

Advancing to step 6:
The number 9 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 70490.0
Deduct 0 from 5 and we're left 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.

Step 7:
9 can be fit into 50 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 70490.5
The remainder is 5 after subtracting 45 from 50.
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:
50 divided by 9 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 70490.55
If we subtract 45 from 50, 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.

After the division, we end up with 70490.55 and a remainder of 0.005.