Wow, just wow! I love the professional learning that takes place on Twitter. If you are not using Twitter for professional development, check out this post for reasons why you should be and for tips on getting started.
I recently tweeted a blog post about the importance of taking the tricks out of math instruction, in this case, subtraction with regrouping. In response to my tweet, an online colleague directed me to a website called nixthetricks.com, where you can download an absolutely free resource, Nix the Tricks, that outlines the most popular “tricks” used to teach math and provides suggestions for the correct way to teach each skill. It is a collaborative effort between high school math teacher Tina Cardone and MTBos, an online math community. It is updated frequently, so be sure to sign up for their emails.