Let's divide 640971 by 99
Our goal is to divide 640971 by 99.

On to step 1:
99 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 99

Let's proceed to step 2:
64 divided by 99 is 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Bring next digit (0) of the dividend behind the 64 and repeat the process: 640 / 99

Advancing to step 3:
99 goes into 640 6 times with a remainder of 46.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 594 away from 640, we end up with 46.
Append the next digit (9) from the dividend to 46 and continue with: 469 / 99

Let's proceed to step 4:
99 can be fit into 469 4 times, resulting in a remainder of 73.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Deduct 396 from 469 and we're left with 73.
Grab the next digit (7) from the dividend, add it to 73, then carry on: 737 / 99

Moving on to step 5:
If we divide 737 by 99, we get 7 and a remainder of 44.
Put 7 as the next digit of the answer. 
Result so far: 647.0
If we subtract 693 from 737, we get 44.
Take the next digit (1) from the dividend and append it to 44, then repeat: 441 / 99

Moving on to step 6:
99 can be fit into 441 4 times, resulting in a remainder of 45.
Put 4 as the next digit of the answer. 
Result so far: 6474.0
If we subtract 396 from 441, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 7:
99 can be fit into 450 4 times, resulting in a remainder of 54.
The next digit of our result is 4. 
Result so far: 6474.4
Subtract 396 from 450 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 8:
If we divide 540 by 99, we get 5 and a remainder of 45.
The next digit of our result is 5. 
Result so far: 6474.45
Subtracting 495 from 540 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 9:
99 goes into 450 4 times with a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 6474.454
Subtract 396 from 450 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 10:
If we divide 540 by 99, we get 5 and a remainder of 45.
The next digit of our result is 5. 
Result so far: 6474.4545
Subtract 495 from 540 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 11:
When dividing 450 by 99, we get 4 with a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 6474.45454
If we take 396 away from 450, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 12:
The number 99 fits into 540 5 times, leaving a remainder of 45.
The next digit of our result is 5. 
Result so far: 6474.454545
Deduct 495 from 540 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 13:
99 goes into 450 4 times with a remainder of 54.
The next digit of our result is 4. 
Result so far: 6474.4545454
The remainder is 54 after subtracting 396 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 14:
99 can be fit into 540 5 times, resulting in a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 6474.45454545
If we subtract 495 from 540, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

After the division, we end up with 6474.45454545 and a remainder of 4.5e-08.