Don't know whether you're talking same units or feet and inches, but here goes anyway:
If you mean 16 x 12 inches and 4 x 8 inches then 16 x 12 needs 3 across and 2 down ie 6 tiles.
If you mean 16 x 12 feet and 4 x 8 inch tiles you will need 24 across and 36 down ie a total of 864 tiles.
Eight squares are needed.
12*12 = 144
320
There are 9 squares I can see 12 squares in an array of 2 * 4 squares
2400 tiles if you don't get any extra
Eight squares are needed.
It depends on how large the squares are. If they are 12" x 12" it would take 108 of them.
105
12*12 = 144
12 square feet
How many squares come in one box. If the squares are 40" x 40", you need 12 of them. You will have scraps left over.
210 of them.
320
12 squares.
18
There are 9 squares I can see 12 squares in an array of 2 * 4 squares
608