My humble apologies for not checking the math on this earlier, but I think you will be OK with yardage because I think it was figured on the way the instructions were written. Just set those strips aside.
If you haven't yet cut your strips for the middle of this month's units, I would like to suggest that you try paper-piecing them using 6 sheets of graph paper for the foundation.
You can get 2 of the short sashing units from a single piece of graph paper so you will need 2 sheets marked for the short units.
Just tape 2 pieces of the graph paper together for the 16-1/2" units, and you will need two longer sheets marked for the them.
For cutting the fabric....just cut one piece 8-1/2" x WOF from the dark green circle print and one piece 8-1/2" x WOF from the red-orange swirl print.
Starch the fabrics.
From each of those fabrics you need to cut 24 strips 1-1/2" wide. Save the remaining pieces of fabric.
Sew the strips to the foundation, alternating colors then trim away the excess resulting in 4 pieces 8-1/2" x 3-1/2" and 4 pieces 16-1/2" x 3-1/2"
If you don't want to paper piece them you can just assemble the strips into pairs, using an accurate 1/4" seam allowance, and combine pairs until you get the necessary 2 sets measuring 8-1/2" and 2 sets measuring 16-1/2", then cut the strips into 3-1/2" wide units.
Many thanks to Andree [url]community/my-profile/AndreeBergeron[/url] for suggesting this technique!