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Argosy University

Pre-Algebra: Lesson 021

Integer Operations
Addition

Lesson Description

Students learn to add integers using a number line, where a positive integer represents a move to the right on the number line, and a negative integer represents a move to the left on the number line. For example, to add -3 + 7, start at zero on the number line, then move 3 units to the left, then move 7 units back to the right, to end up at +4. So -3 + 7 = +4.

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