646560 ÷ 2 
We want to divide 646560 by 2.

Going ahead to step 1:
If we divide 6 by 2, we get 3 and a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 0 after subtracting 6 from 6.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 2

On to step 2:
The number 2 fits into 4 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 32.0
The remainder is 0 after subtracting 4 from 4.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 2

On to step 3:
The number 2 fits into 6 3 times, leaving a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 323.0
Subtract 6 from 6 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 2

Advancing to step 4:
The number 2 fits into 5 2 times, leaving a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 3232.0
Subtract 4 from 5 to get 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 2

On to step 5:
2 goes into 16 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 32328.0
Subtract 16 from 16 to get 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 2

Advancing to step 6:
The number 2 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 323280.0
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:
The number 2 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 323280.0
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.

Going ahead to step 8:
0 divided by 2 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 323280.0
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 result is 323280.0 with a remainder of 0.0.