309929 ÷ 3 
We want to figure out the number of times 309929 can be divided by 3.

Step 1:
When dividing 3 by 3, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 3 from 3 and we're left with 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 3

Let's proceed to step 2:
0 divided by 3 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
The remainder is 0 after subtracting 0 from 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 3

Step 3:
3 goes into 9 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
The remainder is 0 after subtracting 9 from 9.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

On to step 4:
When dividing 9 by 3, we get 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 1033.0
Deduct 9 from 9 and we're left with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 3

On to step 5:
3 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 10330.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 3

On to step 6:
The number 3 fits into 29 9 times, leaving a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 103309.0
Subtracting 27 from 29 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
If we divide 20 by 3, we get 6 and a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 103309.6
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
When dividing 20 by 3, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 103309.66
Subtracting 18 from 20 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 103309.66 with a remainder of 0.002.