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Lesson 4: 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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• what is u peeps talking about
(1 vote)
• what is you have 3 subtraction sighs
(1 vote)
• i’ve always been told i can’t
”add and get less than where i started”
(1 vote)
• Why does 5x speed not exist! I constantly have it at 2x, but it's not enough...
• i get it now thanks
• ok but is it ok