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Learners create an Incan counting device called a quipu (pronounced kee-poo).

Learners work in groups to build model cars from paper parts. First, each learner builds cars individually and the group times themselves.

In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.

Learners make their own simple slide rules out of paper and learn how they work.