Step-by-step solutions to odd-numbered problems from dozens of pre-algebra textbooks.
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Hotmath
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6th grade math knowledge map info
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StudyStack
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A lesson on adding and subtracting positive and negative numbers. Includes examples and helpful rules to remember
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Math is Fun
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Answering questions on different number sets with scoring.
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Number Sets
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Step-by-step solutions to odd-numbered problems from dozens of middle school math 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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Great site to use to get a scientific calculator to solve or check your problems you are working on. Larger and easy to use.
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Scientific Calculator
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Use a virtual balance to solve equations, including those with negative numbers.
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National Library of Virtual Manipulatives
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Work on negative numbers in a fun way. Help Casey Runner cross the finish line by choosing positive or negative signs.
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Math is Fun
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