Make Quarter Square Triangle Parent UnitsQuick pieced half square triangle units are used as parents for the quarter square triangle units.
- Use the easy sandwich method to sew each yellow square to one of the darker squares. When complete, you'll have (4) half square triangle units that measure 3-7/8" x 3-7/8".
If your squares are slightly smaller, press (carefully) again and remeasure. If they're still a bit small, use a slightly narrower seam allowance for the next set.
- Turn two of the half-square triangle units to their reverse sides and draw a diagonal line on each, from one corner to another, placing the line perpendicular to the seam.
- Position a marked and an unmarked triangle unit right sides together, with contrasting triangles facing each other. Align patch edges carefully.
- Sew together with two seams placed a scant 1/4" from each side of the drawn line, the same method used to create the parent units. Cut the squares apart on the line, press units open and trim away triangular nubs at the ends of the seam allowances.
- You now have two quarter-square triangle units. Each should measure 3-1/2" x 3-1/2". Repeat to assemble the remaining two units.
- Refer to the photo on page one, which illustrates four Yankee Puzzle quilt blocks in two rows. Single-out an individual block and arrange your four units in the same way.
- Sew the two units in each row together and press seam allowances in opposite directions. Join the rows, matching edges carefully and butting center seams for a good match.
- Press. Your Yankee Puzzle quilt block should measure 6-1/2" x 6-1/2".