We're dividing 72129 by 99 
Let's see how many times 99 fits into 72129.

Advancing to step 1:
99 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 99

On to step 2:
72 divided by 99 is 0 with a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Bring next digit (1) of the dividend behind the 72 and repeat the process: 721 / 99

Moving on to step 3:
If we divide 721 by 99, we get 7 and a remainder of 28.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 693 away from 721, we end up with 28.
Bring next digit (2) of the dividend behind the 28 and repeat the process: 282 / 99

Advancing to step 4:
99 can be fit into 282 2 times, resulting in a remainder of 84.
Write down 2 as next digit of the result. 
Result so far: 72.0
The remainder is 84 after subtracting 198 from 282.
Include the next digit (9) from the dividend after 84, then repeat: 849 / 99

Let's proceed to step 5:
The number 99 fits into 849 8 times, leaving a remainder of 57.
Use 8 as the next digit of our solution. 
Result so far: 728.0
If we subtract 792 from 849, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Let's proceed to step 6:
If we divide 570 by 99, we get 5 and a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 728.5
Subtract 495 from 570 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 7:
If we divide 750 by 99, we get 7 and a remainder of 57.
Write down 7 as next digit of the result. 
Result so far: 728.57
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 8:
99 can be fit into 570 5 times, resulting in a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 728.575
Deduct 495 from 570 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 9:
750 divided by 99 is 7 with a remainder of 57.
The next digit of our result is 7. 
Result so far: 728.5757
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 10:
The number 99 fits into 570 5 times, leaving a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 728.57575
Subtracting 495 from 570 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 11:
The number 99 fits into 750 7 times, leaving a remainder of 57.
The number 7 becomes the next digit in our result. 
Result so far: 728.575757
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 12:
If we divide 570 by 99, we get 5 and a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 728.5757575
If we take 495 away from 570, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 13:
99 goes into 750 7 times with a remainder of 57.
Record the quotient 7 as the next digit in the result. 
Result so far: 728.57575757
If we subtract 693 from 750, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

The final result is 728.57575757 with a remainder of 5.7e-08.