You would need a total of 207 tiles.
196 whole tiles
7 tiles cut into 28 40-cm x 10-cm pieces
3.5 tiles cut into 28 40-cm x 5-cm pieces
four 10-cm x 5-cm pieces cut from the remaining half tile
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54 tiles are needed
18*18 = 324 tiles.
It depends on the units used for measuring the tiles: 17x17 inches, centimetres etc.
9
4 tiles are needed. 6x6=36 and 8 goes into 36 4 times, therefore 4 tiles are needed.