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.
144 Get 160 to be safe.
72 Get 80 to be safe.
78.47 Pavers
297 16x16-inch tiles.
144.63 pavers
144 Get 160 to be safe.
72 Get 80 to be safe.
It depends on the units used to measure the pavers: inches, centimetres, cubits, etc. It is not possible to answer the question without that information.
78.47 Pavers
111 if you can cut 10 exactly in half to make 20 half pavers
297 16x16-inch tiles.
The answer depends on the measurement units used for 16x16. The answer also depends on the shape of the 390 sq ft area to be covered because the more irregular the shape, the greater the number of pavers you will need to cut. That is likely to result in some breakage. Furthermore, you may not want to use all the offcuts since that will make part of the area into a mosaic.
16x16 square feet = 256 square feet, so two tiles will suffice.
144.63 pavers
Any reason why it shouldn't be 220, apart from the shape of the area?
A 12x12 inch paver is one square foot. So you would need 240 square feet.
4.5 pavers will cover 1 sq foot. So 4.5 x 360 =1620 pavers