1. Fold each stabilizer 9-1⁄2" square in half horizontally and vertically. Finger-press to make placement guidelines; unfold. Aligning template guidelines with stabilizer guidelines, trace Pattern A circle on a stabilizer square. Repeat with remaining stabilizer 9-1⁄2" squares.
2. Layer a marked stabilizer square on right side of a black polka dot 9-1⁄2" square. Sew on traced circle. Cut away both layers 1⁄4" inside stitched circle (Diagram 2). Clip into seam allowance so seam can lay flat after it is turned. Turn stabilizer through opening so it faces wrong side of black polka dot square. Press a few inches of seam allowance at a time until entire circle edge is pressed under. Pin or baste stabilizer and black polka dot square together at corners to make a block unit (Diagram 3).
3. With right sides up, layer block unit atop a strip set with strip seams running diagonally (Diagram 4); pin in place. Using clear monofilament or black thread and a narrow machine zigzag or blind-hem stitch, sew along edge of black polka dot circle. Trim excess stabilizer and strip set on wrong side, leaving 1⁄4" seam allowance, to make a black block. The block should be 9-1⁄2" square including seam allowances.
4. Repeat steps 2 and 3 to make three black blocks total.
5. Using white polka dot 9-1⁄2" squares, repeat steps 2 and 3 to make three white blocks.