Calculating the tip is a great way to practice percentages. These days, I don’t think many people do much math with a pencil and paper. We rely on technology for almost everything — even things as simple as calculating the tip at a restaurant are now done with a tablet on the table or an app on your phone.
I think it’s important, however, to put the technology aside for a bit and work through a problem by yourself. That’s what we’ve been doing here for awhile — by keeping account registers, learning how to calculate percentages, practicing those calculations, and even tracking our spending on vacation. All with pencil and paper. Old school.
My favorite lessons are those that he can practice himself (hands-on!), that make sense in the real-world (are meaningful, relatable and useful), appropriate for his age and are interesting and even fun. (I realize I may be stretching the definition of fun.)
In that vein, I taught J how to calculate a 20% tip at a restaurant.