We're dividing 489399 by 3 
Let's see how many times 3 fits into 489399.

Step 1:
When dividing 4 by 3, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 3 away from 4, we end up with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 3

Step 2:
3 can be fit into 18 6 times, resulting in a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 18 from 18, we get 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 3

Moving on to step 3:
If we divide 9 by 3, we get 3 and a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 163.0
Subtract 9 from 9 to get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 3

Advancing to step 4:
3 divided by 3 is 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 1631.0
Subtracting 3 from 3 leaves us with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 3

Advancing to step 5:
If we divide 9 by 3, we get 3 and a remainder of 0.
The next digit of our result is 3. 
Result so far: 16313.0
The remainder is 0 after subtracting 9 from 9.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 3

Moving on to step 6:
When dividing 9 by 3, we get 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 163133.0
The remainder is 0 after subtracting 9 from 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
3 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 163133.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
0 divided by 3 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 163133.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 163133.0 with a remaining 0.0.