21/42 = 50%
A value of 50% shows up in everyday situations like a store sale, a half-full water bottle, or getting half the questions right on a quiz. It means the amount is split evenly into two parts.
To picture 21/42 quickly, imagine 42 items arranged in two equal groups: 21 would fill one whole group. You can also think of a pizza cut into equal slices, with half the slices set aside.
A common mix-up is thinking that 50% always means 50 items. It actually means half of whatever total you’re working with, so the number of items can vary.
