There are a batch of bricks, each of which is 45 cm long and 30 cm wide. At least how many such bricks can be used to make a square?
45 = 3 × 3 × 5, 30 = 2 × 3 × 5, so the side length of the quadrilateral is 2 × 3 × 3 × 5 = 90cm, it needs: (90 △ 45) × (90 △ 30), = 2 × 3, = 6 (pieces); a: at least 6 such bricks can be used to make a square
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