As my state is just entering into common core, teacher trainings were far and few between for us. I saw so many references in many CCSS frameworks from different states that I decided to purchase this book since I teach math. I am so happy that I did. This book is great! My daughter order the book also. Whoops! When she got it in, it was grades 3-5 inteasd of K-3 as ordered. Well guess what! She moved grades this week and needed the 3-5. We both love this book! What a great resource it is.