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
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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
Ah, what a lovely question! For a 10x10 area, you would need 100 square feet of blocks. Since each block is 10 square feet, you would need 10 blocks to cover that area. Just imagine those blocks creating a beautiful foundation for your creativity to flourish.
4200 cubic feet
1.174 square feet.
16x16 square feet = 256 square feet, so two tiles will suffice.