The Number System

Apply and extend previous understandings of numbers to the system of rational numbers.

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Resource | Resource Type Grade Level | Rating |
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In this one-page article Steven Strogatz discusses the concept of subtraction, and how we use and make sense of negative numbers. He offers a way to understand why the product of two negative numbers is positive and discusses several real world applications of the concept. The author includes references and notes. This article is part of the author's series on the Elements of Math (menu page cataloged separately). | Reference Materials, Article Grade Level: 3, 4, 5, 6+ | |

In this iOS app users try to rescue the Wuzzits by unlocking their cages using the gears provided. The game requires logic and problem solving combined with the composition and decomposition of numbers. The game includes seventy-five different puzzles and rewards the players with points for fewest moves. | Game Grade Level: 3, 4, 5, 6+ |