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Scholastic
Scholastic: Math Maven's Mysteries: The Big Top Carnival Caper
Help the Math Maven figure out how much money it will cost to give a balloon to every tenth person riding the Ferris wheel. Includes a PDF.
Math Is Fun
Math Is Fun: Rotational Symmetry
A definition and several examples of rotational symmetry. View two animations showing types of rotational symmetry, as well as real-life examples, including a dartboard and Ferris wheel.