wireless apple keyboard not working some keys

(There is an option to enable Mouse Keys with five presses of the Option key you may want to turn that option off to avoid accidentally enabling it.) If Mouse Keys is enabled and you are using a keyboard with no numeric keypad or Num Lock function, see Unable to type while Mouse Keys is enabled in Mac OS X. With Mouse Keys enabled, you cannot use the Numeric Keypad to enter numbers-instead the keypad moves the pointer (cursor). In the Accessibilty or Universal Access pane, click the Mouse tab, and make sure Mouse Keys is turned off.With Slow Keys on, you need to press a key for a longer period of time for it to be recognized.

Make sure that Slow Keys is turned off.Click the Accessibilty or Universal Access pane in System Preferences, then click the Keyboard tab.Or, disable the 'Speak selected text when the key is pressed' option. If 'Speak selected text when the key is pressed' is enabled, the key or key combination set to speak text cannot be used for other purposes or used to type text-click Set Key and change it to a less-commonly used key combination (try to use modifier keys such as Shift, Command, Option, and Control).From the Apple menu, choose System Preferences.One or more keys on the keyboard do not respond The following Knowledge Base article offers up some great steps for troubleshooting the issue you're describing:

Wireless apple keyboard not working some keys