This imaginative cross-curricular resource is the perfect way to reinforce basic math skills as well as introduce the study of great "thinkers" to your class. It includes three short biographies: one for Amelia Earhart, one for Martin Luther King, Jr., and one for Marie Curie. Each one contains secret, embedded information. Students must study the biography and crack the code to answer a set of worksheet questions. Within these hidden codes, students will practice fractions, equations, and greatest common factors. Level: Difficult