This applet can be used to model arithmetic of integers with two color counters. The yellow "chips" represent +1, and the red "chips" represent -1. The tool bar and input bar are available so that text and other tools can be used to model problems such as the example showing -3 + 2 = -1.

Use the two color counters to model the following:[br]1. 2 + 3[br]2. -2 + 3[br]3. 3 + (-4)[br]4. -2 + (-3)[br]5. 3 - 2[br]6. 2 - 3[br]7. -2 - (-1)[br]8. -1 - 4[br]9. 1 - (-2)[br]10. 2(3)[br]11. 2(-3)[br]12. -2(3)[br]13. -2(-3)[br]14. 6/2[br]15. -6/2