Jonah will cover a cube in wrapping paper. Each edge of the cube is 2.5 cm long. What is the least amount of wrapping paper he needs to cover the cube?

A cube has 6 square faces, and each face has area 2.5 × 2.5 = 6.25 square centimeters. So the total area to cover is 6 × 6.25 = 37.5 square centimeters. The least amount of wrapping paper needed is 37.5 square centimeters, choice C.

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