# How Addition and Subtraction are Related (Part 3 of 3)

Unit 1: Rational Number Operations
Lesson 9 of 27

## Big Idea: Students use a number line to explore the relationship between addition and subtraction.

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Standards:
Subject(s):
Math, Number Sense and Operations, Additive inverse, Relationship between addition and subtracti, rational numbers
50 minutes

### Grant Harris

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