Pete the Cat and His Four Groovy Buttons - Eric Litwin, James Dean

This book would be perfect for Kindergarten and introducing the math lesson of subtraction.  The rhythm or song of the book would keep student engaged while helping them learn mathematics. Pete the Cat books are also amazing at helping students understanding that things happen that are out of our control, but we keep moving forward and not to let it get you down.  I love the positivity of these books.