College Math CLEP Prep Practice Exam

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Which of these is a real number?

√2
3/2
π
√-4

The correct answer is: √2

A real number is a number that can be shown on a number line, and all of the options listed are numbers. However, option A, √2, is the only one that can be easily placed on a number line without any complex calculations. Option B, 3/2, can be calculated to be 1.5, but may not be as easily seen as a number on a number line. Option C, π, is irrational and never-ending, making it impossible to plot on a number line. Option D, √-4, is imaginary and cannot be represented on a number line at all. Therefore, the only real number in this list is option A, √2.