1/2 = 50%
The fraction 1/2 shows up whenever something is split into two equal parts. You might eat half a sandwich, spend half an hour on homework, or notice that a battery is at 50%.
To picture 1/2 quickly, imagine a pizza cut into two equal slices or a glass filled right to the middle. It is also a useful estimate when comparing amounts that look roughly equal.
A common mistake is thinking that any two pieces make halves, even if one piece is much larger than the other. For something to represent 1/2, the whole must be divided into two parts of equal size.