We look at the division of 872800 by 9 
The aim is to understand the frequency of 9 in 872800.

Step 1:
If we divide 8 by 9, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 9

On to step 2:
87 divided by 9 is 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 9.0
The remainder is 6 after subtracting 81 from 87.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 9

Step 3:
62 divided by 9 is 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
Subtract 54 from 62 to get 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 9

Advancing to step 4:
9 goes into 88 9 times with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 969.0
The remainder is 7 after subtracting 81 from 88.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 9

Advancing to step 5:
9 can be fit into 70 7 times, resulting in a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 9697.0
The remainder is 7 after subtracting 63 from 70.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 9

Moving on to step 6:
9 can be fit into 70 7 times, resulting in a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 96977.0
Deduct 63 from 70 and we're left with 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:
If we divide 70 by 9, we get 7 and a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 96977.7
Subtract 63 from 70 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.

Moving on to step 8:
The number 9 fits into 70 7 times, leaving a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 96977.77
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

In conclusion, the division gives 96977.77 with a balance of 0.007.