Here’s a recent xkcd which as a math educator I found particularly funny. Some questions for my readers:
- What numbers besides 3 and 9 would “work” here?
- Do you have any particularly funny or interesting stories of students getting something right for the wrong reason? Post them in a comment (or, better yet, on your own blog if you have one!).
Also, many parts of my optimal change-carrying challenge remain unanswered (although this is likely due in part to the unfortunate downtime I experienced shortly after publishing it). If you haven’t already, give it a try, you’re sure to find some aspect of the problem that interests you!