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Interactive
Thomas Jefferson National Accelerator Facility

Jefferson Lab: Place Value Game

For Students 1st - 5th Standards
This interactive math game lets you create the largest number possible as the computer gives you numbers.
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Unit Plan
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Power of Ten

For Students 3rd - 6th Standards
This website from The Math Page explains and defines basic arithmetic terms and place value concepts. There is even a practice section at the very end of the lesson.