Let's divide 100720 by 9
The aim is to understand the frequency of 9 in 100720.

Advancing to step 1:
The number 9 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 9

Going ahead to step 2:
9 can be fit into 10 1 times, resulting in a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we take 9 away from 10, we end up with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 9

On to step 3:
When dividing 10 by 9, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtract 9 from 10 to get 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 9

Let's proceed to step 4:
If we divide 17 by 9, we get 1 and a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 111.0
Deduct 9 from 17 and we're left with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 9

Going ahead to step 5:
If we divide 82 by 9, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 1119.0
If we subtract 81 from 82, we get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 9

On to step 6:
9 can be fit into 10 1 times, resulting in a remainder of 1.
The next digit of our result is 1. 
Result so far: 11191.0
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
9 can be fit into 10 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 11191.1
If we take 9 away from 10, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
9 can be fit into 10 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 11191.11
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 11191.11 and a remainder of 0.001.