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Circle puzzles often require thinking backwards. Can you follow the arrows both ways to find the number behind the question mark?

By balancing a chemical equation, we can compare masses of substances taking part in the reaction. What can you say about the mass of sulfuric acid?

Partners want to sit next to each other while dining at a round table. In how many ways can they do that?

In some games, it’s possible to play perfectly. Do we know the winner of this game before it even starts?

Information about average prices of various school supplies allows us to put their prices in order. Which one is the cheapest?

The adoption files for five dogs of different breeds and weights got mixed up. Using these clues, can you figure out who’s who?

We can use the Pythagorean theorem to find sides of a right triangle. Can you find a right triangle in this trapezoid?

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