| Tool: Circle 21 |
Screenshot: 
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| Go to: | http://nlvm.usu.edu/en/nav/frames_asid_188_g_2_t_1.html (opens a new window) | ||
| Description: | A puzzle involving adding positive and negative integers to sum to twenty one. | ||
| 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: |
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| Tools: | Circle 99 | Circle 99 | Number Puzzles | Circle 0 | Circle 3 |
| Courses: | Math 4 | Addition | |
| Math 5 | Addition | ||
| Math 6 | Addition | ||
| Math 7 | Integer operations | ||
| Algebra | Integer Operations | ||
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