Question

1. how many cubes are needed to build this structure? 10 8 9 7

Explanation:

Step1: Count visible cubes

Count the cubes that are clearly visible in the structure. We can see 7 cubes on the outer - most layer.

Step2: Check for hidden cubes

There is 1 hidden cube at the bottom - middle layer that is supporting the upper - layer cubes. So in total, \(7 + 1=8\) cubes.

Answer:

8