Two ways I can think of. If you have graph paper make a square the size you need and then pin it on the fabric. Another way you could do is draw the squares on freezer paper, cut them out and press them on to the paper. If you cut a little larger than 5 1/4 and then sew them and square up the sewn pieces to the size need for the piece that goes on the quilt. They even have freezer paper with the square printed on them if you can find it.