A Squirrel's Trick of "Tree"t is a fun Halloween themed engineering challenge that can be used in the classroom or at a Family Math and Science Night. Students will make a "tree" out of various supplies and try to put as many "acorns" in the tree as possible. To earn more supplies, students can answer squirrel- related math questions correctly. The activity includes a supply list with directions, a picture of a sample "tree", and squirrel related math questions with an answer key.