OK.. I got a few requests last night on calculating fabric for a D9P (Disappearing 9 patch), and let me tell you I have a new admiration for those who teach math!! I also preface this by letting you know that Algebra is the one subject I got VERY poor grades in .. got the answers right.. but couldn't show my work. So here goes...
This is how I calculated my queen/king sized top for my nephew (I'll show a pic at the end). I wanted simple numbers so I went with simple lowest common denominator. I made the squares for the 9 patch 5" each.. that is including seam allowance. For this Tute we are going to use Colors A, B, and C..
color A will be the 4 outside CORNERS of the beginning 9 patch block.. Color B will be the center 4 outside squares in the 9 patch.. color C will be the center square of the 9 patch.
Here we go
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