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Tool: How Many Under the Shell?
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Go to: http://illuminations.nctm.org/Activity.aspx?id=3566 (opens a new window)
Description: After Okta hides some bubbles under a shell, he then either adds more bubbles or takes some away. Students determine how many bubbles are left under the shell.
Technology Type: Computer 
Author: NCTM Illuminations
Language: English 
Cost: Does not require payment for use

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Courses: Kindergarten Addition, Subtraction
Math 1 Addition, Subtraction
Math 2 Addition, Subtraction