In a STEM class at Queenstown Primary, Wei Lin builds a solid using unit cubes. The solid has 3 layers: • Bottom layer: 4 unit cubes in a row • Middle layer: 2 unit cubes placed on the left end of the bottom layer • Top layer: 1 unit cube placed on the left end of the middle layer How many unit cubes did Wei Lin use in total?
Show Worked Solution
Worked Solution
Step 1: Count each layer separately.
Step 2: Bottom layer → 4 unit cubes.
Step 3: Middle layer → 2 unit cubes.
Step 4: Top layer → 1 unit cube.
Step 5: Total = 4 + 2 + 1 = 7 unit cubes.
Answer: 7
Correct answer: 7
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