The simple way to piece those flying geese units is to mark the diagonal of the 2 7/8ths squares. Lay one right sides together at one corner of the yellow print square and stitch a quarter inch from the drawn line. When you get close to the end of the top square lay another one in line and continue stitching. When you have that side stitched turn the square around and stitch the other side a quarter of an inch from the drawn line. The cut on the drawn line and iron the pink triangle open. Turn the unit and lay a pink square on the yellow triangle in the corner and sew on each side of the drawn line. Cut on the drawn line and iron open.