Xiaohua's room is 5.1 meters long and 3 meters wide. How many pieces do you need if you use 30 cm square tiles?

5.1 × 3 = 15.3 (square meter) = 153000 (square centimeter), 30 × 30 = 900 (square centimeter), 153000 ／ 900 = 170 (piece)

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