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Lesson Plan
Scholastic

Scholastic: Max's Math Adventures: Max's Measuring Mania

For Teachers 3rd - 5th Standards
Read about how Max and Ruthie measured some fun objects in their gym. Use this method to measure things in your classroom. A helpful teacher's guide and extra challenges will make this a fun lesson on measuring with nonstandard units.
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Lesson Plan
National Council of Teachers of Mathematics

The Math Forum: A Tour of Measurement

For Teachers 9th - 10th Standards
Peruse a collection of lesson plans, resources and FAQ's about measurement at every grade level.
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Handout
Wikimedia

Wikipedia: International System of Units

For Students 9th - 10th
Wikipedia offers detailed information on SI, or the International System of Units. Includes hyperlinked table of contents for easy site navigation.