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Taking a ski lift to the top of a hill.
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If you add a positive and a negative number, the result can be positive, negative, or zero - depending on which of the numbers has the greater absolute value. Here are some examples: 4 + (-4) = 0 (zero) 4 + (-6) = -2 (negative) 4 + (-2) = 2 (positive)
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-1/2 and 1/2