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The Multiplying Rabbits Riddle

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After years of experiments, you’ve finally created the pets of the future – nano-rabbits! They’re tiny, they’re fuzzy … and they multiply faster than the eye can see. But a rival lab has sabotaged you, threatening the survival of your new friends.

Those pesky Nano Cats! Can you figure out if your nano-rabbits will fit into the bottom cell of your triangular habitat? How many trailing zeros should there be at the end of the count of rabbits? And do you need to pull the emergency shutdown lever?

From TED-Ed and Alex Gendler: The Multiplying Rabbits Riddle. Pause at the rules screen to figure the math out on your own:


Watch this video next: The mathematical secrets of Pascal’s triangle.

Plus, watch more triangle videos, including the Matchstick Triangle Puzzle, the Pythagorean theorem water demo, and Notes on a Triangle.

Bonus: How to multiply numbers by drawing lines and Mathematica – A World of Numbers… and Beyond.

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