It can be cold here in Pennsylvania! One day last winter the temperature was -3°C. In the evening the temperature dropped 6 degrees. After midnight the temperature rose 8 degrees. By noon the next day the temperature had dropped another 4 degrees.
Use this Java applet from the National Library of Virtual Manipulatives to help you model the problem:
Question: What was the temperature at noon in degrees Celsius?
- Use the Free Play setting at the bottom of the page.
- Once you select Free Play you can add individual chips (negative or positive) to the workspace or you can add pairs of chips.
- If you drag a negative chip over a positive chip, watch how they cancel out. Try dragging a positive chip over a negative chip, too.
- If you want to throw away any chips, drag them to the trash can in the corner.