168645 ÷ 2 
Our goal is to divide 168645 by 2.

Step 1:
2 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 2

Let's proceed to step 2:
2 goes into 16 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 16 away from 16, we end up with 0.
Take the next digit (8) from the dividend and append it to 0, then repeat: 8 / 2

Advancing to step 3:
8 divided by 2 is 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 84.0
If we subtract 8 from 8, we get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 2

Advancing to step 4:
When dividing 6 by 2, we get 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 843.0
The remainder is 0 after subtracting 6 from 6.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 2

Going ahead to step 5:
2 can be fit into 4 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 8432.0
Subtract 4 from 4 to get 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 2

On to step 6:
When dividing 5 by 2, we get 2 with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 84322.0
Subtracting 4 from 5 leaves us 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 can be fit into 10 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 84322.5
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.

Let's proceed to step 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 84322.5
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.

Step 9:
The number 2 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 84322.5
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.

The final result is 84322.5 with a remainder of 0.0.