How many floor tiles do you need to make a square with a rectangular floor tile 45 cm long and 30 cm wide?

The least common multiple of 45 and 30 is 90, (90 ／ 45) × (90 ／ 30) = 6 pieces. At least 6 pieces are needed to make a square

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1. There is a rectangular floor tile, each 45 cm long, 30 cm wide, at least how many such floor tiles can be paved into a square?
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7. 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?
8. 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?
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15. A rectangular floor tile is 24 cm long and 18 cm wide. How many floor tiles do you need to make a square with this kind of floor tile
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