In 'Sabotage', a series of train wrecks has the FBI puzzled. Until a note is discovered at the scene of the latest train wreck, the FBI has no leads. When they see that the note contains a code written in a series of numbers, they immediately call Charlie. Charlie is able to break the code in the letter, which helps Don and the FBI find the person who caused the train wrecks. In this activity, students will use a shift cipher to decode messages.
Before the Activity
Download the attached PDF and look over the Teacher Page. Download the attached TI-Navigator file and PDFs for use during the lesson.
During the Activity
Discuss the materials from the Student Page with your class.
After the Activity
Encourage students to explore Web sites and questions from the Extensions Page.