This interactive Java applet game has a user adding positive and negative integers to arrive at a sum of zero. Seven overlapping circles form a ring similar to a Venn diagram. Five blue numbers are in position when the game begins. The remaining nine numbers (from -6 through 7) must be placed in the empty spaces to produce a sum of zero in each circle. There is a unique solution for each puzzle. Instructions for users and teacher information are available through links at the top of the page.
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Contributed by: Utah State University, Publisher

Math TopicLogic, Number Sense, Basic Operations, Number Concepts, Mathematical Practices, Mathematical Processes

Grade Level5, 6+

Resource TypeActivity, Interactive Media

**Additional Information**- AudienceLearner
- LanguageEnglish (USA), French, Spanish
- Education Topic
- Interdisciplinary Connection
- Professional DevelopmentNo
- ContributorUtah State University, Publisher
- Publication Date1999
- RightsCopyright (c) 1999-2010 by Utah State University.

http://nlvm.usu.edu/en/nav/copyright.html - AccessFree access

**Standards**### Common Core State Standards for Mathematics