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This product has 24 number lines to match with 48 different equations. Each number line will have two equations that will match it.
For example if the number line models -4 - 5 = -9, then it will also have a card -4 + - 5 = -9 as a third match.
They are differentiated by the outline of the card. One has a solid line, the other has a dashed line.
My students have a hard time connecting that subtracting is the same as adding a negative; and adding a positive is the same as subtracting a negative.