I distinguish "math" in two ways - the basics add/subtract/multiply and math designed for logic calculations (algebra and geometry both come into play in quilting). I can do the logic sequences, but not the adding/subtracting/multiplying in my head!!
I have calculators EVERYWHERE in the house and I'll grab one to multiple 7 x 4 (seriously!) because the multiplication table was purged from my hard drive (brain) when I discovered I no longer needed it with the easy access to calculators. Now I have room for other stuff in my hard drive.