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This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

In this activity, learners find the answer to the question, "if you have a pile of 8 cards, and you remove half, then half again, how many times can you do this until you get to just one card?" This w

In this pencil and paper activity, learners work in pairs and simulate how astronomical spacecraft and computers create images of objects in space.