To make sure my pieced center would be accurate to an inch, I paper-pieced them on graph paper
Maybe I went overboard with this, but it worked...
Regarding the math for this sashing, I used paper-piecing method (with vellum) for the small triangle, with 3/8 of seam allowance around the template. It required 7 yellow (orange on the kit) strips (1 3/4 inch wide) to get 176 triangles and 32 half triangles, and 7 green strips, to get 192 triangles. I kept 1/4 inch seam allowance with the add-a-quarter ruler when I assembled the triangles - I did not find it made too much bulk - I want to make sure it remains stable - I was affraid 1/8 would be too thin.
Andrée
Thanks for the math. I worked on them yesterday and its just the right size. With Margo's hints from last month it is going smoothly. Of course I haven't put the strips together yet. One step at a time.