I was given these blocks from my guild to make a charity quilt. I was shocked that we can put a man on the moon but can't print an accurate square pattern on fabric. Can't figure that out. I had to sew an 1.25" border on all four sides.
I would have instead iron on fusible very lightweight interfacing (like one uses for a t-shirt quilt) to the back of the fabric because the starch will wash out with the first wash and the quilt might not last too long.