489728 ÷ 12 
We want to figure out the number of times 489728 can be divided by 12.

Step 1:
12 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 12

On to step 2:
When dividing 48 by 12, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 0 after subtracting 48 from 48.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 12

Going ahead to step 3:
12 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 40.0
Subtract 0 from 9 to get 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 12

Step 4:
The number 12 fits into 97 8 times, leaving a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 408.0
The remainder is 1 after subtracting 96 from 97.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 12

Going ahead to step 5:
If we divide 12 by 12, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 4081.0
The remainder is 0 after subtracting 12 from 12.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 12

Moving on to step 6:
When dividing 8 by 12, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 40810.0
If we take 0 away from 8, 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.

On to step 7:
If we divide 80 by 12, we get 6 and a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 40810.6
If we subtract 72 from 80, we 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.

Advancing to step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 40810.66
Deduct 72 from 80 and we're left 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.

The quotient of the division is 40810.66, and the remainder is 0.008.