I am using this book for the to homeschool a four-year-old kindergartener who is excited about getting into "real" book work. The pages are great for extra practice on writing numbers, counting objects to circle them, and identifying more advanced shapes. We combine this book with counting 1's and 10's on the number chart, and exposure to money and the clock, which they also refer to and then teach in this book.
My daughter and I love this book! It started out easy for her, but by lesson 20, is already introducing new concepts. I love how colorful the pages are and the spiraling (review) makes sure she remembers everything she has learned.