When I first spotted this page in Study Arithmetics: Grade Three, a vintage school primer published by Scott, Foresman and Company, I thought of the old filmstrips we had in school. But it turns out, the film show in this old math lesson is “moving picture” film. There are actually several lessons using film as a teaching tool, which is rather cool. If the concept of movie film being understood enough at this time for the average third grader to put to use learning math amazes you, just remember that film was then more commonplace than it is today.
Not all of the lessons are as outdated as you might think! You can see different images from this book here.