Different Properties of Real Numbers
Math.com
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Gives a detailed explanation of how to use interval notation, followed by numerous examples, from very simple to quite complex.
Connexions
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Practice Quiz on Real Numbers, their properties, and their operations
Algebra Lab
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This page describes the sets of numbers, natural, whole, integers, rational, irrational and real numbers. Gives examples and organizes the information well.
Virtual Math Lab by Texas A&M University
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