Let's divide 10091966 by 9
The aim is to understand the frequency of 9 in 10091966.

Moving on to step 1:
When dividing 1 by 9, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 9

On to step 2:
9 goes into 10 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 9 from 10, we get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 9

Let's proceed to step 3:
The number 9 fits into 10 1 times, leaving a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we take 9 away from 10, we end up with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 9

Going ahead to step 4:
9 can be fit into 19 2 times, resulting in a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 112.0
If we take 18 away from 19, we end up with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 9

Let's proceed to step 5:
11 divided by 9 is 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1121.0
The remainder is 2 after subtracting 9 from 11.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 9

On to step 6:
The number 9 fits into 29 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 11213.0
Subtracting 27 from 29 leaves us with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 9

Advancing to step 7:
9 can be fit into 26 2 times, resulting in a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 112132.0
Subtracting 18 from 26 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 9

Advancing to step 8:
If we divide 86 by 9, we get 9 and a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 1121329.0
Subtract 81 from 86 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.

Moving on to step 9:
50 divided by 9 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1121329.5
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.

On to step 10:
9 can be fit into 50 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 1121329.55
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 quotient of the division is 1121329.55, and the remainder is 0.005.