I need some math help
I am making a t-shirt quilt out of my old t-shirts. I am having a devil of a time with the math. I think I'm having a senior moment but it frustrating me to death. So here's the deal:
obviously various different sized blocks, need to finish to 15". So I take my block width measurement which is 7" subtract it from 15" which is 8, divide by 2 (for each side of block) and add back seam allowance of .50 (.25 for each side). But my measurements aren't working. So what am I missing.
TIA,
Bunny