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In this activity, learners create a mind and math puzzle that requires a three-dimensional solution.

In this online brain stumper, the bottom half of a series of letters is covered. You may think you know what it says, but remove the black bar to see if you're right.

This puzzle provides an interesting context which challenges learners to apply their knowledge of the properties of numbers.

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

In this number puzzle/trick, learner #1 thinks of a number between 1 and 63. Learner #2 shows learner #1 six cards and asks them whether the cards contain their number.

In this online puzzle game, learners need to choose a path from a starting number to a goal number. Along the path are simple operations (e.g.

In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

In this activity, learners find as many combinations of a hundred as they can using various puzzle pieces from a hundred square grid paper.