Wei Ming built the solid shown for his Primary 5 Maths corner using identical 1-cm unit cubes. Each small block in the figure is one unit cube. How many unit cubes did he use altogether?
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Worked Solution
Step 1: The solid sits on a 2 × 2 base, so there are 4 columns of cubes.
Step 2: Read the height of each column from the figure.
• Front-left column: 2 cubes stacked.
• Front-right column: 1 cube.
• Back-left column: 1 cube.
• Back-right column: 2 cubes stacked.
Step 3: Add all column heights: 2 + 1 + 1 + 2 = 6 cubes.
Check: a full 2×2×2 cube would have 8 cubes; this solid is missing 2 cubes (one from each shorter column), so 8 − 2 = 6. ✓
Final answer: 6 unit cubes.
Answer: 6
Correct answer: 6
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