What do you plan to make with them? Are you doing it by hand or machine? I have done the GFG quilt by hand and what I did was sew the them first to each one to make a circle, then put the smaller one in the center and sewed them together. Not a great description, I know. When I made the "I Spy" quilt there were triangles sewed to the opposite side, then there were straight sides to sew together. If you google "Hexagon I Spy quilt patterns you can see what I am talking about. There was a "Simply Quilts" sew where it was shown which is what got me started doing them.