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When Paula went to sleep, it was 6 degrees Fahrenheit. When she woke up, the temperature has dropped to -4 degrees. What was the change in temperature while Paula was asleep?

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  1. it dropped 6 to zero, then dropped another 4 to -4

    Total drop: 6-(-4) = 6+4 = 10

    but since drops are negative changes, the total change was -10

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