(Whether they meant to or not!)
Here are samples from the four decks I purchased at NCTM from Dr. Frank Wang’s booth. The cards are available from MathFun.com (maker of the Witzzle Pro) along with some engaging free puzzles to keep your number sense on its toes.
About Cassy Turner
How do I get these flashcards?
Hi Sandy! They were available from Frank Wang, but I don’t see them on his website anymore. You might email and see if he still carries them:https://www.wangeducation.com/productpages/witzzle.shtml