Page 76 - NUMINO Challenge_D2
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Problem solving Key Points
1 A large cube is made up of 27 cubes as shown Remove the cube
below. How many possible ways are there to located at the vertex
remove two cubes without changing the surface such that the surface
area? (The flipped and turned solid figures count area does not change.
as 1.)
2 The cubes are stacked to have a 5th layer in the Find the cubes that
following ways. How many cubes can be have three colored
removed at a time without changing the surface faces when the solid
area? figure is dipped in a
bucket of paint.
1st layer 2nd layer 3rd layer
73Geometry
1 A large cube is made up of 27 cubes as shown Remove the cube
below. How many possible ways are there to located at the vertex
remove two cubes without changing the surface such that the surface
area? (The flipped and turned solid figures count area does not change.
as 1.)
2 The cubes are stacked to have a 5th layer in the Find the cubes that
following ways. How many cubes can be have three colored
removed at a time without changing the surface faces when the solid
area? figure is dipped in a
bucket of paint.
1st layer 2nd layer 3rd layer
73Geometry
