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This activity puts a mathematical twist on the familiar “guessing jar.” No guesses allowed, estimates only.

In this online game, learners run an outer space drink stand and thirsty alien customers are on the way.

In this activity, the learner asks yes-no questions to identify a secret object (similar to Twenty Questions). This game is easy to adapt for different ages and different kinds of contexts.

In this activity about human interface design issues, learners help the Oompa-Loompas of a great chocolate factory solve different problems.