Math Riddles

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These are the best and most fun math riddles we can find. All of these tricky riddles are based on real math concepts and can be solved with purely math and logic.


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Riddle: You have two buckets: one with only white marbles and one with only black marbles. The two buckets have the same number of marbles.

How can you rearrange the marbles to maximize your chances of grabbing a white marble from each?

Answer: Put a single white marble in one bucket and put the rest of the white marbles and all of the black marbles in the other. This makes your odds about 75 percent for grabbing two white marbles.


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You have a large number of friends coming over and they all get thirsty. Your first friend asks for 1/2 a cup of water. Your second friend asks for 1/4 a cup of water. Your third friend asks for 1/8 a cup of water, etc.

How many cups of water do you need to serve your friends?

Answer: Just one. If your friends kept asking for water like this forever one cup would be enough.


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Riddle: Why does the second shape have an open block when the first shape does not?

Answer: The two triangles have different slopes so in the second shape the two triangles cause the shape to bulge out to account for the extra square unit.


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Riddle: What single line can you add to the following statement to make it true?


Answer: Add a line to the first '+' to make it a 4.



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Riddle: You have two books. One of them is upside-down and the other is rotated so the top of the book is facing you.

What is the sum of the first page in each book?

Answer: 2. The first page in each book is page number 1 regardless of how they are oriented and 1 + 1 = 2.


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