Originally Posted by
SlightlyOffQuilter
if the blocks are in fact set rectangular like you said, 6 inches wide, and 12 inches long, the grid would need to be 9 blocks Across, and 7 blocks down to achieve the 54 x 84 inch size.
edited to add : Since the block size is stated to be 6 x 12 , it may look like they are " square " blocks if each individual section is a 6 inch block, just done two at a time .
Ah! That, I believe, is the answer. It did occur to me that they might be considering two units as one "block". I assume, then, that this is the reasoning. The photo, which also shows the cross hatch quilting, shows an obviously square "unit" but that may not be what they are calling a "block" if they are combining two units to make a block.
So happy to have it explained! I plan to make my quilt the way I want, and now don't have to buy the pattern just to satisfy my curiosity about their measurements.
Thanks to all who responded!