Measurement-3

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 * Everything You Wanted to Know about Perimeter and Area**

http://www.hbschool.com/activity/length_strength1_centi/
 * Measuring Centimeters**

http://www.shodor.org/interactivate/activities/PerimeterExplorer/
 * Perimeter Explorer**

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 * Area Explorer**

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 * Reading Scale**