We look at the division of 99039264 by 646 
We want to figure out the number of times 99039264 can be divided by 646.

Advancing to step 1:
The number 646 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 646

Step 2:
99 divided by 646 is 0 with a remainder of 99.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 99 and we're left with 99.
Take the next digit (0) from the dividend and append it to 99, then repeat: 990 / 646

Step 3:
646 can be fit into 990 1 times, resulting in a remainder of 344.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 344 after subtracting 646 from 990.
Include the next digit (3) from the dividend after 344, then repeat: 3443 / 646

Advancing to step 4:
3443 divided by 646 is 5 with a remainder of 213.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 3230 from 3443 to get 213.
Bring next digit (9) of the dividend behind the 213 and repeat the process: 2139 / 646

Moving on to step 5:
2139 divided by 646 is 3 with a remainder of 201.
The next digit of our result is 3. 
Result so far: 153.0
The remainder is 201 after subtracting 1938 from 2139.
Fetch the next digit (2) from the dividend, attach it to 201 and continue: 2012 / 646

On to step 6:
When dividing 2012 by 646, we get 3 with a remainder of 74.
The number 3 becomes the next digit in our result. 
Result so far: 1533.0
If we subtract 1938 from 2012, we get 74.
Append the next digit (6) from the dividend to 74 and continue with: 746 / 646

Going ahead to step 7:
746 divided by 646 is 1 with a remainder of 100.
Record the quotient 1 as the next digit in the result. 
Result so far: 15331.0
Subtracting 646 from 746 leaves us with 100.
Grab the next digit (4) from the dividend, add it to 100, then carry on: 1004 / 646

Moving on to step 8:
1004 divided by 646 is 1 with a remainder of 358.
The next digit of our result is 1. 
Result so far: 153311.0
Deduct 646 from 1004 and we're left with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Let's proceed to step 9:
3580 divided by 646 is 5 with a remainder of 350.
Put 5 as the next digit of the answer. 
Result so far: 153311.5
Deduct 3230 from 3580 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

On to step 10:
646 can be fit into 3500 5 times, resulting in a remainder of 270.
The number 5 becomes the next digit in our result. 
Result so far: 153311.55
Subtract 3230 from 3500 to get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

In conclusion, the division gives 153311.55 with a balance of 0.27.