Assemble the Block
1. Sew together one white print triangle and one red print triangle to make a triangle-square (Diagram 1). Press the seam allowance toward the red triangle. Repeat to make a total of four triangle-squares.
2. Lay out the triangle-squares and remaining squares in three horizontal rows (Block Assembly Diagram). Sew together the squares in each row. Press the seam allowances toward the white or blue print squares. Then join the rows to make a block. Press the seam allowances in one direction.