Microsoft Word provides option to insert chapter number for a document in Word 2013 and Word 2010 similar to previous versions. This option is available under the insert menu. Listed below are the steps to add chapter number for a document in Word 2013 and Word 2010
Navigate to Insert Menu and click on the Page Number drop down arrow.
This would display the following list of options, select Format Page Numbers from the menu list.
In the Page Number Format option, tick the Include chapter number check box to insert chapter number in a word document.
You can also choose the style for the chapter and separator.