A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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Description of the properties of real numbers
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Algebra Help
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Gives a detailed explanation of how to use interval notation, followed by numerous examples, from very simple to quite complex.
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Connexions
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Different Properties of Real Numbers
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Math.com
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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.
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Virtual Math Lab by Texas A&M University
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Step-by-step solutions to odd-numbered problems from dozens of precalculus textbooks.
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Hotmath
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Flashcards to self-test about the properties of real numbers
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Quia
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Practice Quiz on Real Numbers, their properties, and their operations
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Algebra Lab
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