Which of the following is an irrational number?

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Multiple Choice

Which of the following is an irrational number?

Explanation:
An irrational number is a real number that cannot be written as a ratio of two integers. Pi is irrational because its decimal expansion goes on forever without repeating, so it cannot be expressed as a fraction of integers. The other options are rational: 1/3 is a ratio of integers; 0.5 equals 1/2; and sqrt(4) equals 2, an integer. Therefore, pi is the irrational number.

An irrational number is a real number that cannot be written as a ratio of two integers. Pi is irrational because its decimal expansion goes on forever without repeating, so it cannot be expressed as a fraction of integers. The other options are rational: 1/3 is a ratio of integers; 0.5 equals 1/2; and sqrt(4) equals 2, an integer. Therefore, pi is the irrational number.

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