Add a square root symbol — also known as a radical sign — to a Microsoft Word document by using the program's AutoCorrect feature, inserting a symbol or typing an Alt code.
Type an AutoCorrect Keyword
Word, like all other Microsoft Office programs, comes with a spell checker called AutoCorrect. In addition to checking for typos, AutoCorrect can also turn a series of predefined keywords into math symbols. For example, insert a square root symbol in Word by typing \sqrt in the document, followed by a space. Upon pressing the space bar, Word automatically turns \sqrt into a square root symbol.
Insert a Square Root Symbol
Open the Insert tab and click the Symbol button. Select More Symbols.
Select Mathematical Operators from the Subset drop-down menu and double-click the radical sign in the list of available symbols to insert it in your document.
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Type an Alt Code
By typing specific codes known as Alt Codes on your keypad, you can insert mathematical symbols into your Office documents.
Press the Alt key and hold it down.
Type 8730 on your keypad and release the Alt key. Word then inserts a radical sign in your document.