Step-by-step solutions to odd-numbered problems from dozens of pre-algebra textbooks.
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Hotmath
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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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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Step-by-step solutions to odd-numbered problems from dozens of algebra textbooks.
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Hotmath
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In this video, Salman Khan of Khan Academy explains integer sums.
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Khan Academy
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Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
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Paul's Online Math Notes
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Questions and answers from experts.
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Ask Dr. Math
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A list of divisibility rules and examples of how to apply them.
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Math is Fun
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