Show the total number of pages

1. On the Insert tab, select   Page Number.

2. Select a location such as Top of Page, Bottom of Page, or Current Position.

3. Scroll down until you see Page X of Y and select a style.

1. On the Insert tab, select   Page Numbers.

2. Select a page number location style.

3. Check Include Page Count.

Word for Mac doesn't directly support showing the total number of pages, but here is a workaround: 

1. Double-click in the header or footer area to open it.

2. On the Header & Footer tab, select  Page Number and choose Alignment.

3. Select the area next to the page number, type "of" and a space, and choose    Field.

4. Select Document Information, under Categories, and NumPages under Field names. 

5. Select   Close Header and Footer to exit.