Move the black arrow to the answer.
Then, click the checkboxes to reveal the two integers you are adding. Move the tail of the blue arrow to the head of the red arrow.

1. Work with the applet until you think you can add integers with confidence.
2. Create a rule for adding two integers. What happens when both numbers are positive? What happens when both numbers are negative? What if one is positive and the other is negative?
3. How would you explain your rule to a classmate?