Caging Mice

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Put a different number of mice in each cage.

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Pick Up the Sticks

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Devise a strategy so that you’re the one leaving the last stick on the table every time. 

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The Differences Between Horses and People

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You know how many legs and heads are in a crowd. Now determine how many horses are there.

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Constructing Triangles

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Construct triangles with particular attributes.

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Relationships in the Hundreds

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Find numbers in the hundreds with a special relationship among the digits.

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Take a Different Base

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Determine numbers in different bases.

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Summing Away

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Find the sum of consecutive integers.

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Counting the Years

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Using personally significant dates, you can find a surprising result.

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Sum of Consecutive Integers

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Use the sum of consecutive integers to form certain numbers. 

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Odd and Strange

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Discover some strange properties about a mysterious number.

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