How many pieces of rectangular cardboard do you need to make a square with 6 cm long and 4 cm wide?

4 = 2 × 2, 6 = 2 × 3, the least common multiple of 6 and 4 is: 2 × 2 × 3 = 12, that is, the side length of the square is 12 cm, (12 △ 6) × (12 △ 4), = 2 × 3, = 6 (pieces); a: at least 6 pieces of such cardboard are required

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