Sheet # 81/Positive and Negative Numbers
Name: ________________________ Date_____________
Explain and Show Your Work.
1) When the room heater broke, the temperature in the room dropped from 20 degrees C to - 5 degrees C. By how many degrees did the temperature drop?
2) During a blizzard, the temperature dropped from 23 degrees F to - 12 degrees F. How many degrees did the temperature drop?
3) The average temperature in a refrigerator is 3 degrees C. Tom played around with the thermostat. The temperature dropped to - 5 degrees C. How many degrees did the temperature drop?
4) One New York morning, the temperature was - 5 degrees F. After lunch, the temperature had risen to 20 degrees F. How many degrees did the temperature increase?
5) A chemist measured the temperature change of a liquid. At 8:15 the temperature was 24 degrees C. At 8:27 the temperature was - 2 degrees C. How much did the temperature decrease in that time period?
Answers for sheet # 81
1) 20 - (-5) = 20 + 5 = 25 degrees
2) 23 - (-12) = 23 + 12 = 35 degrees
3) 3 - (-5) = 3 + 5 = 8 degrees
4) 20 - (-5) = 25 degrees
5) 24 - (-2) = 26 degrees