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At Mathville Elementary School, all 242 students have marbles. Can we be certain that at least two students at the school have the same number of marbles?

Justine only has one pumpkin. She wants to trade it at the market for as many corn cobs as possible. Help her figure out how many corn cobs she can get.

Mr. Blaise has set up a rotating sprinkler on his lawn to water it. However, some areas cannot be reached by the sprinkler. What portion of his lawn will remain dry?

Help the city planner design the new look of city hall. Nested circles, areas, radii — there’s plenty to think about!

Principle Estimate the amount of toilet paper needed to cover the classroom.

Ben is in charge of a ride at the amusement center where he works. When will he take his next break? That all depends on the merry-go-round !

Discover how the magician manages to calculate faster than the calculator, and you too can impress the crowd.

Principle Reconstruct the secret solids by using their projections.

After a long day of drawing, Théo puts away his colored crayons and makes an interesting discovery. How many does he have in total?