One meter has 100 cm. (centi means "1/100"), so a square meter has (100 x 100) square cm., and a cubic meter has (100 x 100 x 100) cubic cm.
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10 000
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
There are 1/100 m in one cm.