Do you have kids?
Microsoft Math 3.0 is a set of mathematical tools that can help you get your work done quickly and easily. The primary tool in Microsoft Math is a full-featured scientific calculator with extensive graphing and equation-solving capabilities.
You can use it just like a handheld calculator by clicking buttons, or you can use your keyboard to type mathematical expressions. Microsoft Math now supports ink input for Tablet PC users and optimizations for Ultra-Mobile PC users.
Additional math tools help you evaluate triangles or convert values from one unit of measurement to another.
All for the low cost of $19.95! Downloadable now!
http://www.microsoft.com/math/ProductDetails.aspx?pid=001&active_tab=Features
Kurt Shintaku's Blog 