The question cannot be answered. A cubic metre is a measure of volume while a square metre is a measure of area. The two measure different things and it does not make sense to try to convert from one to the other.
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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
Answer: 150 ft² = 13.9354 m²
150 tiles
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.
The square root (or cubic root, or fourth root, etc.) of any positive integer can only be: a) either an integer, b) or an irrational number.