Pages and Keynote are two of the applications included in Apple's iWork suite of productivity software. Pages is a program for word processing and layout design, while Keynote is a program for visual presentations similar to PowerPoint. Although you cannot open Pages documents directly in Keynote, you can convert them to PDF files and then add them to slides in your Keynote presentation.
Launch the Pages application and open the document that you want to include in your Keynote presentation file.
Go to "File" in the top menubar and choose "Export."
Select the "PDF" tab at the top of the pop-up window and then click "Next."
Highlight the "Desktop" icon from the "Places" list on the left side of the window and press "Export" to convert the Pages document to a PDF file.
Close Pages and open your Keynote presentation file.
Navigate to the slide where you want to use the content from the Pages document.
Go to "Insert" in the top menubar and select the "Choose" option.
Highlight the "Desktop" icon on the left side of the window and then double-click on the PDF file you just created to import it into your presentation.