Coding works for other fields. The free-response questions for AP Computer science require pupils to develop code to solve a problem. Problems range from creating a histogram to developing an encryption program. Teachers use the...

Students brainstorm and discuss the concept of cryptography, the science of secrets in today's world and then focus on a system for sending secret messages used by Julius Caesar. They make a Caesar wheel assessing encrypting and...

Students role-play as soldiers rescuing lost mountain climbers. Working in teams, they interpret maps to locate the climbers and use flashlights to send and receive coded messages about the rescue. Their goal is to complete the task in...

Find out the basics of modular arithmetic.