309520 ÷ 2 
We want to figure out the number of times 309520 can be divided by 2.

On to step 1:
2 can be fit into 3 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 2 away from 3, we end up with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 2

On to step 2:
The number 2 fits into 10 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 15.0
Deduct 10 from 10 and we're left with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 2

Step 3:
The number 2 fits into 9 4 times, leaving a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 154.0
Subtracting 8 from 9 leaves us with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 2

Let's proceed to step 4:
When dividing 15 by 2, we get 7 with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 1547.0
Subtracting 14 from 15 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 2

Going ahead to step 5:
2 can be fit into 12 6 times, resulting in a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 15476.0
Subtract 12 from 12 to get 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 2

Step 6:
If we divide 0 by 2, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 154760.0
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.

Let's proceed to step 7:
2 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 154760.0
If we subtract 0 from 0, we 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 8:
When dividing 0 by 2, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 154760.0
If we subtract 0 from 0, we 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.

The final outcome is 154760.0, with a leftover of 0.0.