This summer I read the book Guided Math by Laney Sammons. Chapter 3 was all about using Math Warm-Ups. A quote that stuck out to me was, "Participating in a variety of brief mathematical activities during the first 20-30 minutes of the day leads students to make subtle mental shifts into the world of mathematical awareness and learning." (Laney Sammons also has a book called Daily Math Stretches for K-2 that sounds interesting, but I haven't checked it out yet!) This is why I've always tried…