Aisha used 18 identical 1-cm cubes to build a solid for her art project. She now wants to add more 1-cm cubes to the solid so that it becomes a larger cube with each edge measuring 3 cm. How many more 1-cm cubes does she need?
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Worked Solution
Step 1: Find how many 1-cm cubes are needed to fill a 3 cm × 3 cm × 3 cm cube. Number of cubes = 3 × 3 × 3 = 27.
Step 2: Aisha already has 18 cubes built.
Step 3: Cubes still needed = total cubes for the 3 cm cube − cubes already used = 27 − 18 = 9.
Check (reverse): 18 + 9 = 27, and 27 = 3 × 3 × 3 ✓.
Final answer: 9 more 1-cm cubes.
Answer: 9
Correct answer: 9
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