A staircase solid is built from unit cubes. The bottom column has 3 cubes high, the middle column has 2 cubes high, and the right column has 1 cube high (viewed from the front). The solid is 2 unit cubes deep. How many unit cubes are needed to build this solid?
Show Worked Solution
Worked Solution
Step 1: Count cubes in one layer (1 unit deep), column by column.
Left column: 3 cubes high
Middle column: 2 cubes high
Right column: 1 cube high
Total for 1 layer = 3 + 2 + 1 = 6 cubes
Step 2: Multiply by depth.
6 × 2 = 12 cubes
Correct answer: 12
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