We're dividing 78991 by 2 
We want to figure out the number of times 78991 can be divided by 2.

On to step 1:
The number 2 fits into 7 3 times, leaving a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 6 from 7 and we're left with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 2

Going ahead to step 2:
The number 2 fits into 18 9 times, leaving a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 39.0
The remainder is 0 after subtracting 18 from 18.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 2

Let's proceed to step 3:
The number 2 fits into 9 4 times, leaving a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 394.0
The remainder is 1 after subtracting 8 from 9.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 2

Moving on to step 4:
2 can be fit into 19 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 3949.0
Subtract 18 from 19 to get 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 2

On to step 5:
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: 39495.0
The remainder is 1 after subtracting 10 from 11.
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 6:
10 divided by 2 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 39495.5
If we subtract 10 from 10, 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:
When dividing 0 by 2, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 39495.5
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.

Step 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 39495.5
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.

Our division results in 39495.5 with a remaining 0.0.