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Zero, negative, and fractional exponents | Pre-Algebra | Khan Academy

Zero, Negative, and Fractional Exponents Practice this lesson yourself on KhanAcademy.org right now: ...

2010-04-08 14:04 581,460
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Unit conversion within the metric system | Pre-Algebra | Khan Academy

Metric unit conversion Practice this yourself on Khan Academy right now: ...

2007-01-15 09:17 849,558
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