68491793 ÷ 2 
We want to divide 68491793 by 2.

Going ahead to step 1:
6 divided by 2 is 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 6 away from 6, we end up with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 2

Going ahead to step 2:
2 can be fit into 8 4 times, resulting in a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we take 8 away from 8, we end up with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 2

Advancing 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: 342.0
Deduct 4 from 4 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 2

Let's proceed to step 4:
The number 2 fits into 9 4 times, leaving a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 3424.0
The remainder is 1 after subtracting 8 from 9.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 2

Step 5:
When dividing 11 by 2, we get 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 34245.0
Subtract 10 from 11 to get 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 2

Step 6:
The number 2 fits into 17 8 times, leaving a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 342458.0
If we take 16 away from 17, we end up with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 2

Advancing to step 7:
If we divide 19 by 2, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 3424589.0
Subtract 18 from 19 to get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 2

Going ahead to step 8:
When dividing 13 by 2, we get 6 with a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 34245896.0
The remainder is 1 after subtracting 12 from 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
10 divided by 2 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 34245896.5
If we take 10 away from 10, 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.

Going ahead to step 10:
2 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 34245896.5
If we subtract 0 from 0, 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.

Step 11:
2 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 34245896.5
The remainder is 0 after subtracting 0 from 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 34245896.5, with a leftover of 0.0.