"Cookie jar. Stool./Cookies? Cool./One for me. One for you./That makes two." So begins an adventure in simple math--the conceptual adding of numbers--beyond standard counting books. As the child brings more cookies and toy cars, and takes some away, the value of sharing becomes meaningful even to the youngest members of the family. Playfully making points about both math and sharing, Grace Lin's dynamic patterns and vibrant colors leap off the page.