We look at the division of 639823 by 72 
We want to figure out the number of times 639823 can be divided by 72.

On to step 1:
6 divided by 72 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 72

Step 2:
63 divided by 72 is 0 with a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 72

Let's proceed to step 3:
The number 72 fits into 639 8 times, leaving a remainder of 63.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 576 from 639, we get 63.
Bring next digit (8) of the dividend behind the 63 and repeat the process: 638 / 72

Going ahead to step 4:
When dividing 638 by 72, we get 8 with a remainder of 62.
The next digit of our result is 8. 
Result so far: 88.0
The remainder is 62 after subtracting 576 from 638.
Fetch the next digit (2) from the dividend, attach it to 62 and continue: 622 / 72

On to step 5:
622 divided by 72 is 8 with a remainder of 46.
Put 8 as the next digit of the answer. 
Result so far: 888.0
Subtract 576 from 622 to get 46.
Append the next digit (3) from the dividend to 46 and continue with: 463 / 72

Going ahead to step 6:
If we divide 463 by 72, we get 6 and a remainder of 31.
Record the quotient 6 as the next digit in the result. 
Result so far: 8886.0
If we subtract 432 from 463, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 7:
The number 72 fits into 310 4 times, leaving a remainder of 22.
The next digit of our result is 4. 
Result so far: 8886.4
The remainder is 22 after subtracting 288 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 8:
72 can be fit into 220 3 times, resulting in a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 8886.43
Subtracting 216 from 220 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
72 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 8886.43
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
If we divide 400 by 72, we get 5 and a remainder of 40.
Write down 5 as next digit of the result. 
Result so far: 8886.4305
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 11:
The number 72 fits into 400 5 times, leaving a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 8886.43055
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 8886.43055, with a leftover of 4e-05.