Circle 21
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.
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
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