We divide 644142 by 2
We want to divide 644142 by 2.

On to step 1:
If we divide 6 by 2, we get 3 and a remainder of 0.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 6 from 6, we get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 2

Moving on to step 2:
4 divided by 2 is 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
If we take 4 away from 4, we end up with 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 2

Let's proceed to step 3:
When dividing 4 by 2, we get 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 322.0
If we take 4 away from 4, we end up with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 2

Going ahead to step 4:
2 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 3220.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 2

Moving on to step 5:
When dividing 14 by 2, we get 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 32207.0
Subtract 14 from 14 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 2

Let's proceed to step 6:
2 goes into 2 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 322071.0
If we subtract 2 from 2, 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.

On to step 7:
2 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 322071.0
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.

Let's proceed to step 8:
2 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 322071.0
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.

The final outcome is 322071.0, with a leftover of 0.0.