We're dividing 66099 by 9 
We want to figure out the number of times 66099 can be divided by 9.

Step 1:
9 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 9

Going ahead to step 2:
9 goes into 66 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 63 from 66 to get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 9

Going ahead to step 3:
9 can be fit into 30 3 times, resulting in a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 73.0
If we subtract 27 from 30, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 9

On to step 4:
The number 9 fits into 39 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 734.0
Subtract 36 from 39 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 9

Step 5:
39 divided by 9 is 4 with a remainder of 3.
The next digit of our result is 4. 
Result so far: 7344.0
The remainder is 3 after subtracting 36 from 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 6:
9 can be fit into 30 3 times, resulting in a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 7344.3
The remainder is 3 after subtracting 27 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
When dividing 30 by 9, we get 3 with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 7344.33
If we take 27 away from 30, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The quotient of the division is 7344.33, and the remainder is 0.003.