8) 4" background squares
4) 4" red check squares
4) 4" red fireworks squares
Draw a diagonal line on the back of all eight background squares.
Match the four red fireworks squares with four of the lighter background squares.
Match the four red check squares with four lighter background squares.
Place the squares right sides together with the outside edges aligned.
Sew 1/4 inch on each side of the line.
Cut on the line.
Square to 3 1/2 inches and trim the corners from each end of the seam to eliminate bulk.
Press toward the darker fabrics.
Use the photo above to arrange and sew the half square triangles to form the block.