Letha's Fan: Foundation Piecing TWO

This is a way of trimming taught me by Judi Mendelsohn though I had heard it described before.

Place a card on the next line to be sewn.

Fold back the foundation over onto the card.

Use a ruler to trim 1/4" away from the line as a seam
allowance.

Trim.

Trimmed pieces; both sides have been trimmed in this way.

Now you have a nice accurate straight edge against which to
set the next fabric pieces.