72431 ÷ 9 
We want to figure out the number of times 72431 can be divided by 9.

On to step 1:
The number 9 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 9

Step 2:
9 goes into 72 8 times with a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 0 after subtracting 72 from 72.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 9

Moving on to step 3:
9 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 80.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 9

Moving on to step 4:
The number 9 fits into 43 4 times, leaving a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 804.0
If we subtract 36 from 43, we get 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 9

Advancing to step 5:
71 divided by 9 is 7 with a remainder of 8.
The next digit of our result is 7. 
Result so far: 8047.0
Subtracting 63 from 71 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 6:
If we divide 80 by 9, we get 8 and a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 8047.8
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
9 goes into 80 8 times with a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 8047.88
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The quotient of the division is 8047.88, and the remainder is 0.008.