MathType is a powerful interactive equation editor for Windows that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, elearning, and for TeX, LaTeX, and MathML documents.

More Ways to Create Equations
Entering Math by Hand: Enter equations as easily as you would write math with paper and pencil! This feature uses the built-in handwriting recognition in Windows 7.
Point-and-Click Editing with Automatic Formatting: Create equations quickly by choosing templates from MathType's palettes and typing into their empty slots. MathType applies mathematical spacing rules automatically as you type.
Keyboard Shortcuts: Save time using keyboard shortcuts. MathType has customizable keyboard shortcuts for virtually every symbol, template, and command.
Type TeX or LaTeX: If you already know the TeX typesetting language, you can enter equations directly into MathType or Microsoft Word documents. TeX editing can be mixed with point-and-click editing so you get the best of both worlds. You can even paste in equations from existing TeX documents.
Copy-and-Paste: If you created your equation in another application or found one on a website, why take the time to create it by hand again? Simply copy-and-paste it directly into MathType, and it is ready to edit or use in your work.
Save Expressions in the Toolbar: Drag frequently used equations and expressions to the MathType toolbar so they can be inserted later with just a click or a keystroke.
Microsoft Office 2007 & 2010 — MathType Ribbon Tab in Word and PowerPoint: MathType takes full advantage of Office's Ribbon User Interface making it easier than ever to do equation operations in documents and presentations. New equation numbering and browse features work with all Word equation types.
Microsoft Office 2003 and XP (2002) — MathType Toolbar and Menu in Word and PowerPoint: MathType adds a toolbar and menu to Microsoft Word and PowerPoint, allowing quick access to its features and powerful commands to do equation numbering, produce great-looking math web pages, presentations, and much more.
Find Symbols: MathType's Insert Symbol dialog allows you to explore the available symbols and insert them with a click or keystroke.