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Circle 21

Web-based Practice

Circle 21

Grade Levels

Course, Subject

Mathematics

Virtual Manipulative

Description

The goal of this puzzle is to put three numbers inside of each circle so that they add up to 21.
Solve the puzzle by dragging the black numbers to the blank spaces. You cannot move the blue numbers.
When the three numbers inside any circle add up to 21, the circle changes color.

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Content Collections

Content Provider

The National Library of Virtual Manipulatives is a three-year NSF supported project to develop a library of uniquely interactive, web-based virtual manipulatives or concept tutorials, mostly in the form of Java applets, for mathematics instruction (K-8 emphasis). The project includes dissemination and extensive internal and external evaluation. For more information, please visit http://nlvm.usu.edu/en/nav/vlibrary.html.

Credits

Principal Investigators
Larry Cannon
Jim Dorward
Bob Heal
Leo Edwards

Java Applet Programming
Ethy Cannon
Joel Duffin
David Stowell
Zeke Susman
Richard Wellman
Jennifer Youngberg

Web Site Programming
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