Simply by chance, I found a solution.
- Open up your PPT presentation in Normal view
- Open up a Word file and make a table 2 columns wide by however many rows long.
- In the PPT presentation, click on the little slide image and Copy it (cmd-C, or using a menu, as you wish)
- In the Word file, click in a table cell, and Paste the copied image - cmd-V or using a menu
Another route, takes a bit longer, is: in the PPT file, do File > Save as Pictures. That will make a folder with a jpeg image of each file. You can easily copy or drag each image into a Word file, and you could convert all the images to smaller dimensions first if you wanted to, in Preview or using image software such as Photoshop Elements to batch process.