The technique I prefer to make quarter square triangles comes from Wendy Gilbert “A Star for all Seasons Table Runner and Placemats”. This book is a Quilt in a Day Publication.
You will use the 5.5 inch squares of the Print A and Print B.
Marking the Diagonal Line on the Squares

Ohio Star Quarter Square Triangles
+ Place squares right sides together and press with your iron to help them stay together.
+ With the lightest fabric up, fold diagonally and press a light fold in the 2 squares. The fold needs to be one you can see when sewing.
+Press a second fold by folding the squares diagonally the other way. Do not press the other crease out of the fabric, press up to the first fold and away from it to the other corner.
Note: When I am working on a larger number of blocks I work on a third, or half of the total amount at one time. I go through the steps and then the total number of pieces doesn’t seem so overwelming to me.
Stitching the Seam

Ohio Star Quarter Square Triangles
+All Seams are 1/4 inch wide and from 10 – 12 stitches per inch
+ Line up one square with the point at the needle. You will be stitching on the Left side of the pressed fold to the Center of the square
+Leaving the needle in the fabric, lift the presser foot and turn to stitch along the pressed fold to 1/4 inch on the right side of the pressed fold.
+Now you will be sewing your seam 1/4 inch on the Right side of the pressed fold to the bottom of the square.
Turn the block to the other diagonal line and stitch the 1/4 inch seam like you did for the first diagonal.
Continue to next post for Cutting of Squares, Pressing, and finished square