Can you explain why the multiplication method in the following video works? How about your upper-elementary or middle school students — can they explain it to you?
Pause the video at 4:30, before he gives the interpretation himself. After you have decided how you would explain it, hit “play” and listen to his explanation.
Multiplication with Rectangles
I liked that James Tanton didn’t use the standard pencil-and-paper method for multiplying numbers, but instead explained multiplication as a rectangle. Rectangles are a versatile model for multiplication, and the model will be even more useful when our students get to algebra.
Your students will have fun practicing rectangle multiplication with these sample pages from Beast Academy:
- Count up your rectangles: the lesson.
- Count up your rectangles: practice pages.
- Make perfect squares: the lesson.
- Make perfect squares: practice pages.
And be sure to check out the Beast Academy printable resources page for more fun math you can play.
Update: Another Multiplication Challenge