Originally Posted by pocoellie
I came up with 5.5". The 2" would be 1 1/2 x 2=3 + the 3 would be 2 1/2, I don't know how they come up with 6. Sorry, can't help you there.
That would only be true if you were taking 1/2 inch seams. You are only sewing on one side of the outside strips which would be -1/4". The center strip would be - 1/2" since you are sewing on both sides of it. No matter how you figure it you should end up with a 6 inch square.