857291 ÷ 2 
We want to divide 857291 by 2.

Let's proceed to step 1:
If we divide 8 by 2, we get 4 and a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 8 from 8 leaves us with 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 2

Step 2:
5 divided by 2 is 2 with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtracting 4 from 5 leaves us with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 2

Step 3:
When dividing 17 by 2, we get 8 with a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 428.0
Deduct 16 from 17 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 2

Step 4:
When dividing 12 by 2, we get 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 4286.0
Deduct 12 from 12 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 2

Step 5:
2 can be fit into 9 4 times, resulting in a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 42864.0
If we subtract 8 from 9, we get 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 2

Let's proceed to step 6:
11 divided by 2 is 5 with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 428645.0
If we take 10 away from 11, 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.

Advancing to step 7:
2 goes into 10 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 428645.5
Subtract 10 from 10 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.

Advancing to step 8:
If we divide 0 by 2, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 428645.5
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.

Moving on to step 9:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 428645.5
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 428645.5 with a remainder of 0.0.