There are 10 concrete block per m2.
90 * 140 acres = 50,990 390.9 m2
Oh, dude, if you're talking about standard concrete blocks that are 16 inches long and 8 inches wide, you'd have about 10.8 blocks per square meter if they were laid flat. But hey, who's counting, right? Just make sure you measure twice and lay once, or something like that.
13 m2
140 m2
50
1 cent = 40468 m2
10000 cm2 in one m2
If it has one, it'll attach to the engine at the bottom of the oil pan, and, on some engines, the right side of the block.
complete: 1300cm2=------M2
5000 m2 is 1.24 acres.
1000 m2 = 0.247 acres