It depends on the units used for 320x320. Are they 320 mm x 320 mm tiles or 320 cm * 302 cm tiles or some other unit of measurement? It would have helped if you could have been bothered to specify.
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16X16 tiles are 1.78 sq ft per tile divide 320 by 1.78
320
320 feet = 97.536 metres
320
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.