I use a method I found in a magazine at least 15 years ago..it uses a larger square plus 4 smaller squares. There is math to figure out what sizes you need. First 2 squares are put onto the larger square on opposite corners and you draw a line down the center and sew 1/4" on each side of the line. Then you cut apart and press. Next, onto each of the 2 units you add a square, again draw a diagonal line and sew on each side of it, and then cut apart and press. You end up with 4 units with no waste. As long as you cut accurately and sew accurately, this is a wonderful method.