7th Grade Challenging Math

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7-29)   Answer

           25%

Solution:

Assume the original cube's total surface area is 1 x 1 x 6 = 6

1 surface of the smaller cube is 1/2 x 1/2 = 1/4, Each cube has 6 faces, and the total surface area of 1 cube is 1/4 x 6 = 3/2 = 1.5

Therefore, 1.5 ÷ 6 = 25%