We divide 641781 by 2
We want to divide 641781 by 2.

Step 1:
2 goes into 6 3 times with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 0 after subtracting 6 from 6.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 2

Advancing to step 2:
When dividing 4 by 2, we get 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 32.0
If we take 4 away from 4, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 2

Let's proceed to step 3:
The number 2 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 320.0
Subtract 0 from 1 to get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 2

Moving on to step 4:
When dividing 17 by 2, we get 8 with a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 3208.0
If we take 16 away from 17, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 2

Moving on to step 5:
2 goes into 18 9 times with a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 32089.0
Subtract 18 from 18 to get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 2

Moving on to step 6:
1 divided by 2 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 320890.0
If we take 0 away from 1, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
2 can be fit into 10 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 320890.5
The remainder is 0 after subtracting 10 from 10.
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:
The number 2 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 320890.5
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.

On to step 9:
If we divide 0 by 2, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 320890.5
Subtracting 0 from 0 leaves us 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 320890.5 with a remainder of 0.0.