1 m2 = 1m * 1m = 100 cm * 100 cm = 10000 cm2
Each tile = 10cm * 10 cm = 100 cm2
So, number of tiles = 10000/100 = 100
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You would need 25 (5x5).
That depends entirely on the thickness of each tile !
One square foot is 12 inches by 12 inches so you can fit in it 9 tiles in a 3 tiles by 3 tiles square.
1 (square meter) = 10.76 square feet.
There are 100 cm in a meter, so the wall is 400 cm X 1200 cm. If there is no gap between the tiles: then 400 cm / 4 cm = 100 tiles, and 1200 cm / 4 cm = 300 tiles. So 100 x 300 = 30,000 tiles.