Originally Posted by PrettyCurious
If you place a 6" square piece of paper on a 12" one, you will see you needed to divide it by 4, then add your 1/2" seem allowance
The op is talking about the individual pieces that make up the block.
So if you have a four 6" finished blocks making up a 12" block, you do want to divide each piece by 2 and add the seam allowance.
That will give you four 3.5" blocks, which will make a finished 6" 4-patch block.
Your way would have four 1.5" blocks, with a finished block size of 3", which would be too small for what she wanted.