Let's divide 640299 by 99
We're looking to find how many times 99 goes into 640299.

Step 1:
If we divide 6 by 99, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 99

Moving on to step 2:
99 goes into 64 0 times with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Bring next digit (0) of the dividend behind the 64 and repeat the process: 640 / 99

Moving on to step 3:
99 goes into 640 6 times with a remainder of 46.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 594 from 640, we get 46.
Fetch the next digit (2) from the dividend, attach it to 46 and continue: 462 / 99

Step 4:
When dividing 462 by 99, we get 4 with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Subtract 396 from 462 to get 66.
Fetch the next digit (9) from the dividend, attach it to 66 and continue: 669 / 99

Moving on to step 5:
If we divide 669 by 99, we get 6 and a remainder of 75.
The next digit of our result is 6. 
Result so far: 646.0
If we subtract 594 from 669, we get 75.
Include the next digit (9) from the dividend after 75, then repeat: 759 / 99

On to step 6:
99 goes into 759 7 times with a remainder of 66.
Record the quotient 7 as the next digit in the result. 
Result so far: 6467.0
If we take 693 away from 759, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 7:
If we divide 660 by 99, we get 6 and a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 6467.6
Subtracting 594 from 660 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 8:
The number 99 fits into 660 6 times, leaving a remainder of 66.
Record the quotient 6 as the next digit in the result. 
Result so far: 6467.66
Deduct 594 from 660 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The quotient of the division is 6467.66, and the remainder is 0.066.