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Negative number addition and subtraction: word problems


Adeline lives in Fairbanks, Alaska. She recorded the low temperature for five days on the number line.
A vertical number line from negative 20 to 0. There are 5 labeled points. From bottom to top, the point at negative 18 is labeled, Friday: negative 18 degrees Celsius; the point at negative 13 is labeled, Wednesday: negative 13 degrees Celsius; the point at negative 11 is labeled, Tuesday: negative 11 degrees Celsius; the point at negative 8 is labeled, Thursday: negative 8 degrees Celsius; and the point at negative 4 is labeled, Monday: negative 4 degrees Celsius.
What is the change in temperature from Wednesday to Thursday?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi