A cube is made of 5 x 5 x 5 small cubes and its outer surface is painted. How many small faces are painted in total?
Answer and explanation
Correct answer: C. 150
- Step 1: Each of the 6 big faces shows 5 x 5 = 25 small faces. Step 2. 6 x 25 = 150. Answer: 150. Why not the others: 125: the number of small cubes was given. 30: only one row of faces per side was counted. 100: only four faces were counted.
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