a lot of laptop keyboards lack a numpad, but usually you can access the numpad keys by pressing Function (Fn) and the correct key. I know a lot of laptops, Mac and Windows, have 0 as Fn-M. However, I heard newer mac laptops lack this feature, so maybe your bluetooth keyboard lacks it too. You can try remapping the keys, this page says:
To modify keyboard shortcuts, use the KeyEd Up script from Jeff Almasol, which is available on the Adobe After Effects Exchange website.
Sebastien Perier provides instructions on his website for assigning keyboard shortcuts to scripts so that you can run a script with a single keystroke. This technique relies on the KeyEd Up script.
For information on remapping keyboard shortcuts for keyboard layouts other than the standard US English layout, see Jonas Hummelstrand’s website.
Note: On Mac OS, some keyboard commands for interacting with the operating system conflict with keyboard commands for interacting with After Effects. Select Use System Shortcut Keys in the General preferences to override the After Effects keyboard command in some cases in which there’s a conflict with the Mac OS keyboard command.
EDIT: Joey beat me… check his video. I think it’s pretty good, but I had forgotten about it…