Multiply the length by the width.
To find the minimum number of tiles to cover an area, divide the total area by the area of one tile.
(This is straightforward when tiles are 1 foot square.)
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The answer depends on the dimensions used for 8x8. For example, an 8 inch x 8 inch tile will have a different area to an 8 cm x 8 cm tile.
43.543
Whenever different units are specified in a problem, we need to convert them to one common unit. The total area is given in square meters but the tile measurements are given in cm. So let's convert the tile measurements to meters. Why not convert the total area to square centimeters. Sure you can, only thing is all measurements must be in the same unit. No mixing of units. So the tile size in meters is 0.3m x 0.3m and so the area of a single tile is 0.09 square meter. Divide total area by area of a single tile and you will get the number of tiles needed. Thus the number of tiles needed is 18.5/0.09 = 205.5 tiles, make it 206 tiles.
One 9 inch square tile would presumably be 9in x 9in or 81in2, unless you are meaning 3in x 3in tile which is then 9in2. Regardless, the answer to your question is the total area of the floor (in square inches) divided by the total area of one tile (in square inches).
6 x 24 inch tile = 144 sq in = 1 sq ft 400/1 = 400 tiles