Show the total number of pages

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  Field.

3. Under Categories, select Document Information.

4. Press tab to Field names, select NumPages. Select   Close Header and Footer to exit.

Tip: If you are putting individual page numbers, add of and the field to the right of the page number. This will show in a format of Page 2 of 5.