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## Arithmetic

### Course: Arithmetic>Unit 18

Lesson 8: Subtracting negative numbers fluently

# Adding the opposite with number lines

Explore the claim that subtracting a number is the same as adding its opposite using number lines. We move to the right on the number line when we add a positive number. We move to the left on the number line both when we subtract a positive number and when we add a negative number. So which direction do we draw the arrow when we subtract a negative number on the number line? Created by Sal Khan.

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