It does seem logical; but it seem to defy that logic. One light is sewn to one dark, marked and sewn on the one diagonal line....on each side of that diagonal line and cut and pressed open. Again it is put front to front, watching where the light and dark placement is, and is again marked and sewn on each side of the line so an hour glass is formed, finishing as a 6 1/2 (finished six inch) block.
Thank you, dunster, for seeing my problem with the math... it fails to add up for me. I think I need twice as much as stated in the instructions (or that I got). If two yards yields 60 blocks, then I need twice that amount plus eight blocks more or two more strips beyond the two additional yards or 15 inches, making it 2 yards and 15 inches more fabric that I need to make the 128 blocks for the king sized quilt. The patterned blocks are every other block, so that makes the quilt 96 x 96 inches square. Now if I can find more of the light and dark fabric!