>on my ti-83, something is wrong when i try to divide by 2<pi>. example: >10/2<pi>=15.70796327.what my calc is doing is multiplying 10x1.570796327. >could someone please help me on this. Division and multiplication are done in the order found. To do what you want, do this: 10/(2<pi>) The parentheses make the multiplication execute first. Tom Lake ICQ #25589135