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A.  Convert 2 dm to meters: 2 dm × 0.1 meter/dm = 0.2 meter
      Area of one tile = 0.2 m × 0.2 m =  0.04 sq. meter

B.  Find the area of the floor:
     A = (length) ×(width)
     A = (2.8 m) (1.6 m)
     A = 4.48 sq. meters

C.  Divide the floor area by the area of a tile
      4.48 sq meters/0.04 sq meter = numbers of tiles needed
      = 112 tiles

112 tiles are needed to cover the floor area.