I can use a number line to show addition as a specific distance from a particular number in one direction or the other, depending on the sign of the value being added.
1st - Study up. Watch some or all of these videos.
2nd - Try it out. Take these practice quizes and play these games to see how you are doing...
3rd - Now, get a "Request for Retake" form from Mr. Grubb and show him that you know this concept!