The question, as stated, cannot be answered sensibly. A cubic metre is a measure of volume, with dimensions [L3]. A square metre is a measure of area, with dimensions [L2]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
For example, 1 cu metre of sand will fill an area of 50000 m2 to a depth of 0.00002 metres (or 0.02 mm). Or 500 cu metres will fill the same area to a depth of 0.01 metres (1 cm).
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24 m2 is the same as 240,000 cm2. As each tile is 400 cm2, the number of tiles required to fill the area is 240,000 divided by 400, which equals 600, so you will need 600 tiles.
9.
9 of them.
1 cubic meter = 1000 liters. It doesn't matter what you are measuring.
Non. you can not equate a length measurement (the meter) with an area measurement (the square km).