Not in Word for the web, though you’ll see equations that are already in your document. If you have the desktop version of Word, that’s where you can add or edit mathematical equations.
To open your document in the desktop version of Word, click Open in Word.
When you save the document and reopen it in Word for the web, you’ll see the changes you made.
Tip: Got a suggestion for this feature?
Vote for an idea, or share a new one in our suggestion box at word.uservoice.com.