This blog is hosted on WordPress.com. You can read their privacy notice here.
If you want to comment on a post, we ask for your name (you can use a pseudonym) and email address—your home website is optional, for those who want the link. This helps us detect and avoid spam comments.
If you subscribe to blog posts by email (the blue envelope icon in the social media links above), those come from Feedburner, which is a Google service. You can read Google’s privacy policy here.
If you ask to receive updates about our books, we use your email address only to send you the newsletter(s) you request. These updates will include promotional material such as notice of a book release, limited-time discount prices, or other news.
Our newsletters are powered by MailerLite. You can read their privacy policy here.
We will not contact you directly unless it’s necessary to reply to your comment or question. For instance, if you offered to host the Playful Math Education Blog Carnival, we’ll need to confirm your date and send you information. We LOVE carnival hosts!
We do not share your name or email, except where it’s necessary to provide the service (comment posting or newletter) you requested, or unless the law requires us to do so.
Want to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.
o.m.g. They’re fabulous! I’m going to have my college students watch this.
James Tanton has a video that does the same thing on a whiteboard, just drawing the rectangles, but I think it’s even more magical to see it acted out with the blocks.
That’s really neat! Really shows why in this case minus X minus has to be a plus.
I must use manipulatives to represent the grid method for multiplication in class!
Nicely done!