Unit 6 Contents

You can tell the difference between negative and positive numbers by the way they are written. “Negative five” is written as “−5.”

Show how to use a number line to represent and solve each problem.

1. Tom, Rhonda, and Professor Peabody arrive in Minnesota and find that the temperature is −10°F. They watch the weather report and see that the temperature will be twenty degrees warmer on Monday morning. Find the temperature on Monday morning.
2. On Tuesday the temperature was −12°F at midnight. By the next day the temperature had risen 24 degrees. What was the temperature the next day?
3. If the overnight temperature in Alaska was −8°F, but the temperature rose to 18° during the day, what was the difference between these low and high temperatures? Is this a positive change or a negative change?
4. At midday the temperature was 5°F. The temperature then fell by 11° that evening. What was the final evening temperature?
5. The temperature is 20° below zero. How much must it rise to reach −3°?