160 sq ft = 160 * 12 *12 = 23,040 sq inches. Each block is 4 * 8 = 32 sq inches so number of blocks needed = 23,040 / 32 = 720.
810
Assuming they are 8 inch*16 inch blocks, 144 square feet = 144*12*12 square inches. So number of blocks required = 144*12*12/(8*16) = 162
720 4"x 8" tiles are needed.
2.78 square feet.
It depends on whether the blocks are laid with a 8x8 face up or 8x16.
64
I think perhaps 2250 blocks .
810
Assuming they are 8 inch*16 inch blocks, 144 square feet = 144*12*12 square inches. So number of blocks required = 144*12*12/(8*16) = 162
720 4"x 8" tiles are needed.
2.78 square feet.
12 x 12 blocks (assumed as 12 inch x 12 inch) That means the blocks are 1 square foot each Hence to cover 240 square feet area, you would need 240 blocks
2.77 square feet.
2.25 square feet.
More information is needed EG what type of 12 inch blocks there are many(see link below). Also what way up are you using these blocks. http://www.boralbestblock.com/product-lines/masonry/standard-block/12-inch-block
3.5555 square feet.
64 of them.