8/16 = 50%
A fraction like 8/16 shows up when half of something is used, filled, or completed. For example, if 8 out of 16 seats on a bus are occupied, the bus is 50% full.
You can picture 8/16 quickly by imagining a whole divided into two equal parts, with one part shaded. It is also easy to estimate as “about half,” since the numerator is exactly half of the denominator.
A common mistake is thinking 8/16 is less than half just because both numbers look different. The fraction is equal to 1/2, so it represents the same amount as half, not a small portion.