Check out realworldath.org!
Math teachers are always looking for more ways to show how math relates to the realworld. Real World Math is a collection of free math activities for Google Earth. Teachers have access to lessons and additional material to integrate activities effectively. It is ideally for mathematics for grades 4 and up, but many lessons can be interdisciplinary. This is a modern approach to mathematics that is student-centered and task-oriented; it embraces active learning, constructivism, and project-based activities, while remaining true to the standards. It is not just for teachers, students have access too! Including activities, videos, and instructional tutorials for Google Earth & SketchUp. Students will find some familiar concepts and learn some ideas. All of the lessons are technology-based and can be completed in the classroom or at home. This is where you'll find the answer to, "When are we ever gonna need this?"