10 000
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1 sq metre = 1 m x 1 m = 100 cm x 100 cm = 10000 sq cm.
10 000
1 meter = 100 cm (1 m x 1 m) = 1 square meter = (100 cm x 100 cm) = 10,000 square cm 1 square cm = 1/10,000 = 0.0001 square meter
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
60 cm = 0,6 m 290 cm = 2,90 m 0,6 * 2,90 = 1,74 square meters