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CK-12 Foundation
Ck 12: Elem Math: Representing Numbers in Expanded Form I
[Free Registration/Login may be required to access all resource tools.] The interactive PLIX tool allows students to drag and drop base blocks (1, 10, 100) to find the total area of an irregular figure. The video shows an example of a...
Thomas Jefferson National Accelerator Facility
Jefferson Lab: Place Value Game
This interactive math game lets you create the largest number possible as the computer gives you numbers.