871321 ÷ 2 
We're looking to find how many times 2 goes into 871321.

Going ahead to step 1:
When dividing 8 by 2, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 8 from 8 and we're left with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 2

Let's proceed to step 2:
If we divide 7 by 2, we get 3 and a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 43.0
Deduct 6 from 7 and we're left with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 2

Step 3:
When dividing 11 by 2, we get 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 435.0
Deduct 10 from 11 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 2

Step 4:
The number 2 fits into 13 6 times, leaving a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 4356.0
The remainder is 1 after subtracting 12 from 13.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 2

Step 5:
12 divided by 2 is 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 43566.0
If we subtract 12 from 12, we get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 2

Step 6:
2 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 435660.0
Deduct 0 from 1 and we're left 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.

Going ahead to step 7:
2 goes into 10 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 435660.5
Subtracting 10 from 10 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.

Going ahead to step 8:
If we divide 0 by 2, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 435660.5
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 9:
If we divide 0 by 2, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 435660.5
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.

Our division results in 435660.5 with a remaining 0.0.