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Which is not a perfect square

Identifying which is not a perfect square

This math skill involves identifying numbers that are not perfect squares. It teaches checking whether a number can be expressed as the product of an integer with itself by comparing it to known sequential perfect squares. If the number falls between two squares, it's not a perfect square.

Learn which is not a perfect square

Teaching Transcript

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Which of these numbers is not a perfect square?

Let's list a few sequential perfect squares.

Three of our numbers are on the list as perfect squares.

80 is between 64 and 81, which are the squares of 8 and 9. There aren't any integers between 8 and 9, so we know that 80 cannot be a perfect square.

Skill Practice

Identifying which is not a perfect square

Test your understanding of which is not a perfect square by practicing it! Work through the below exercises to use it in practice.