Tool:
Circle 0 
Screenshot:

Go to: 
http://nlvm.usu.edu/en/nav/frames_asid_122_g_3_t_1.html
(opens a new window)

Description: 
Position the 14 numbers inside of the circles and intersections of circles in such a way that the three numbers in each of the circles sums (adds up) to zero. 
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 

Average Rating: 
[4]

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roch 
Comment:  This is more than just naked number calculations with positive and negative integersit makes the player use strategy and be aware of more than one math operation at a time. 

iris08 
Comment:  The game involves quite a bit of strategy (which may be a good or a bad thing). Due to this, the user ends up doing much more calculating and recalculating number combinations in order to win the game. 
