Fun or Funny Fri Foto ~ Caculating Quilt Squares

For some this may not be fun, 

but I find recalculating a quilt square to be a fun challenge.

I'm either changing it to a 12½ inch square

or

taking an old pattern made only by cutting out shapes

and converting it to the modern day tricks of creating the pieces

as in creating 8 half square triangles in the bottom right corner.