Invite your students to engage in these self-guided critical thinking exercises. This packet includes four units. Students will be asked to classify animals, solve a time measurement problem, determine the longitude and latitude of cities around the world, and more. The units may be given to individual students or small groups who might benefit from a challenge. Student Self-Check sections follow each unit, supplying correct answers as well as ideas to provoke further thinking. Challenge your students to new levels of logical thinking and doing with this innovative resource.