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The Candy Store

How many jelly beans are in the jar? See if you can figure out the exact count -- not just an estimate.

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Travel Problems

Three logical challenges to bring on your next vacation.

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Hockey Problems

What is the probability your team will win a best-of-seven series?

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Jordan Ellenberg: The Lottery Scheme

Ten years ago a group of M.I.T. students cracked the Massachusetts State Lottery. Can you figure out how they did it? A challenge from superstar mathematician Jordan Ellenberg.

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America!

Some patriotic number teasers to enliven your Fourth of July.

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Four Fractions

Challenge your slicing skills with this puzzle about fractions.

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U.S. Team Wins First Place at International Math Olympiad

The U.S. team has won the 2016 International Math Olympiad. Try two problems from this year's test, moderated by U.S. Coach Po-Shen Loh.

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Dodging 9s

Take a crack at this algebra challenge by Sam Vandervelde, head of Proof School in San Francisco.

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The Same Court Time

Activate your Olympic spirit with a challenge from the Rio resident and mathematician Marco Moriconi.

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Olympic Strategies, Part 1

Try these Olympics-themed puzzles from Po-Shen Loh, team lead for Team U.S.A, winner of this year's International Mathematical Olympiad. Also -- If you could train with the best, would you?...

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