Explain how to determine whether to move right or left on the number line when adding rational numbers

If you're adding a negative number you move to the left, because that's where negative numbers are. if you're adding a positive number you move to the right.
example:
-4 + 7
you move seven spots to the right, since 7 is positive the result is 3
4 + -5
move 5 spots to the left, since 5 is negative, the result is -1.

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