From Kevin:
If you have an iPhone or an iPod Touch, you can use it as a number pad for your laptop. You just need the NumberKey app on.
From Jan:
Here are the results I found for the keypad. I think that the second one looks the most promising, at least the most universal for teachers.
Use your iPhone/iPod and the NumberKey Connect software on your Mac. You can then use your iPhone/iPod as a wireless number keypad for you Mac.
Download a copy of Takayama Fumihiko’s free KeyRemap4MacBook. This is a PreferencePane that lets you remap the Mac’s keyboard in interesting ways.
In order to bring the MacBook’s number pad functions back from the dead you need do nothing more than install KeyRemap4MacBook and restart your Mac. If you’re running Snow Leopard you don’t have to remap anything or even open the Preference Pane. Just hold down Fn plus the letters you mentioned and your laptop will cheerfully produce numbers as did your old one.
If you’re running Leopard you must open KeyRemap4MacBook in System Preferences, flip down the triangle next to Remap Fn Key, and enable the Fn to Fn (with NumLock) option. Your Leopard-running laptop will now have a functional number pad
Here is the web page for that software.
http://pqrs.org/macosx/keyremap4macbook/index.html
