20/40 = 50%
The fraction 20/40 represents 50%, or half of a whole. You might see this when 20 out of 40 students turn in an assignment, half of a 40-question test is completed, or 20 of 40 seats are filled.
You can picture 20/40 by imagining a pizza, chocolate bar, or group of 40 objects divided into two equal parts. If one part contains 20 objects, the amount is about half, making it easy to estimate as 50% quickly.
A common mistake is thinking that 20/40 is only 20% because the numerator is 20. The denominator matters because it tells you the total, so 20 out of 40 means half rather than 20 out of 100.
