990 ÷ 3 
We're looking to find how many times 3 goes into 990.

Going ahead to step 1:
3 goes into 9 3 times with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 9 away from 9, we end up with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

Step 2:
9 divided by 3 is 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 33.0
If we subtract 9 from 9, we get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 3

Step 3:
0 divided by 3 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 330.0
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.

Step 4:
3 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 330.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 5:
0 divided by 3 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 330.0
Deduct 0 from 0 and we're left 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.

The final outcome is 330.0, with a leftover of 0.0.