15/30 = 50%
A fraction like 15/30, or 50%, shows up when something is half of a whole. For example, a store might offer 50% off an item, a student might answer half the questions correctly, or a phone battery might be halfway charged.
To picture 15/30 quickly, imagine 30 equal squares with 15 shaded. The shaded part would cover exactly half the group, so you can estimate it as 1 out of every 2 parts.
A common mistake is thinking that 15/30 is less than half because both numbers seem fairly large. The important point is that the numerator is half the denominator, so the fraction represents an even split.
