Area of each tile = 30*30 = 900 mm2.
Area to be covered = 1000*1000 = 1,000,000 mm2
So, number of tiles required = 1,000,000/900 = 1111.11... tiles.
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150 tiles
30 square meters = ~322.92 square feet.
30 square meters is 300,000 square cm
12 inches = 1 foot Thus the tiles would be 1 foot square. You therefore need 30 to cover a 30 square foot room.
A 30 m by 30 m square. Each of the tiles is 20 cm by 20 cm [20 cm = 0.20 m]. So 30 m / 0.20 m = 150. So you need 150 x 150 = 22500 tiles