In this interactive from APT, learn to identify opposite numbers on a number line and explore the opposite of the opposite of a number. In the accompanying classroom activity, students use the interactive and then play a game in which they randomly generate positive and negative integers, including opposites of opposites, place them on the number line, and compare to find which is larger. To get the most from the lesson, students should be comfortable positioning and comparing integers on the number line. This resource is part of the Math at the Core: Middle School Collection.

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