16" x 16" = 0.165 sq metres, approx.
So number of tiles required = roundup(39/0.165) = 236.13 = 237.
That is the mathematical answer. In real life it will depend on the shape of the area (a circular shape will require a lot more tiles to be cut), what proportion of offcuts can be used, your skills as a tiler. Since you need to ask this question I assume the latter is pretty basic, so I would suggest you get at 7% extra tiles.
297 16x16-inch tiles.
125 16-inch tiles.
90 tiles.
1121/2 16x16-inch tiles.
150 16x16" tiles; you'll have a small part of one tile left over.
141
First I would convert 16x16 inch tiles in feet 16x16 inch tiles = 1.25x1.25 feet tiles To calculate the square feet that one tile takes up multiply 1.25 x 1.25 1.25 x 1.25 = 1.5625 sq feet Now calculate 190/1.5625 to find the number of tiles that can fit in 190 square feet 190/1.5625 = 121.6 You will need 121-122 square tiles
16X16=256 inches 12X12=144 inches=1 Square Foot 126X144=18144 18144/256=79 79 16X16 tiles
16X16 tiles are 1.78 sq ft per tile divide 320 by 1.78
Each 16 inch tile is 1.78 square feet. You would need 169 tiles, plus some for spoilage.
16 inch x 16 inch = 16x16/144 = 1.777777.... sq.ft. 450/1.777777..... = 253.125 tiles (not counting any wastage caused by cutting, breakage, etc) = 254 tiles minimum.
16 x 16 = 256 sq in = 1.777 sq ft 420/1.777 = 237 tiles approximately