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8 is the least.

You cant can't have a piece of length 6, thus no two corners of the 6x6x6 cube can be part of the same piece, the cube has 8 corners, we need then a minimum of 8 pieces.

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8 is the minimumleast.

Hint: Can

You cant have a piece of length 6, thus no two corners of the 6x6x6 cube can be part of the same piece?

Hint2: How many , the cube has 8 cornersdoes , we need then a cube have?minimum of 8 pieces.

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8 is the minimum.

Hint: Can two corners of the 6x6x6 cube be part of the same piece?

Hint2: How many corners does a cube have?