64394099 ÷ 99 
Let's see how many times 99 fits into 64394099.

On to step 1:
When dividing 6 by 99, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 99

Moving on to step 2:
99 goes into 64 0 times with a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (3) from the dividend to 64 and continue with: 643 / 99

Step 3:
When dividing 643 by 99, we get 6 with a remainder of 49.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we take 594 away from 643, we end up with 49.
Include the next digit (9) from the dividend after 49, then repeat: 499 / 99

On to step 4:
If we divide 499 by 99, we get 5 and a remainder of 4.
The next digit of our result is 5. 
Result so far: 65.0
If we subtract 495 from 499, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 99

Step 5:
When dividing 44 by 99, we get 0 with a remainder of 44.
Record the quotient 0 as the next digit in the result. 
Result so far: 650.0
If we take 0 away from 44, we end up with 44.
Grab the next digit (0) from the dividend, add it to 44, then carry on: 440 / 99

Step 6:
440 divided by 99 is 4 with a remainder of 44.
The next digit of our result is 4. 
Result so far: 6504.0
Subtract 396 from 440 to get 44.
Take the next digit (9) from the dividend and append it to 44, then repeat: 449 / 99

Going ahead to step 7:
If we divide 449 by 99, we get 4 and a remainder of 53.
Record the quotient 4 as the next digit in the result. 
Result so far: 65044.0
If we take 396 away from 449, we end up with 53.
Fetch the next digit (9) from the dividend, attach it to 53 and continue: 539 / 99

Step 8:
When dividing 539 by 99, we get 5 with a remainder of 44.
The number 5 becomes the next digit in our result. 
Result so far: 650445.0
The remainder is 44 after subtracting 495 from 539.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 9:
99 goes into 440 4 times with a remainder of 44.
Use 4 as the next digit of our solution. 
Result so far: 650445.4
If we take 396 away from 440, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 10:
If we divide 440 by 99, we get 4 and a remainder of 44.
Use 4 as the next digit of our solution. 
Result so far: 650445.44
Subtract 396 from 440 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final result is 650445.44 with a remainder of 0.044.