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Tool: Circle 99
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Go to: http://nlvm.usu.edu/en/nav/frames_asid_269_g_3_t_1.html (opens a new window)
Description: A puzzle involving adding positive and negative integers to sum to ninety nine.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: National Library of Virtual Manipulatives (Utah State University)
Language: English 
Cost: Does not require payment for use

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