Enter expressions using the equation editor and let WordMat calculate the result.WordMat can also be used as an editor that uses MikTex to create actual LaTex documents.WordMat installs LaTex fonts and includes a template which mimics the look of LaTex documents.
Everything can be entered using the keyboard WordMat is free, released under GNU General Public Licence. When installed a menu will be available in Word granting access to advanced mathematical functions.