To resolve the issue of the number pad not working on your keyboard, please follow these step-by-step instructions:

1. Check Num Lock: The first step is to ensure that the Num Lock key is turned on. This key toggles the functionality of the number pad. Look for a key labeled "Num Lock" on your keyboard and press it to enable the number pad. You may see an indicator light turn on if it is functioning properly - learn more.

2. Disable Mouse Keys: If the Mouse Keys feature is turned on, it can interfere with the operation of the number pad. To disable it:
- Go to System Preferences on your Mac.
- Select Accessibility.
- Click on Pointer Control in the sidebar.
- If "Enable Mouse Keys" is checked, uncheck it to disable this feature.

3. Update Keyboard Driver: Ensure your keyboard drivers are up-to-date. You can check for updates:
- Open System Preferences.
- Select Software Update and install any available updates. Restart your computer if prompted - learn more.

4. Test with an External Keyboard: If you're using a laptop keyboard, connect an external USB keyboard to see if the number pad works there. If it does, your laptop keyboard may have a hardware issue - learn more.

5. Clean the Keyboard: Sometimes dirt or debris can cause keys to stop functioning. Gently clean your keyboard with compressed air or a soft cloth to remove any potential obstructions.

6. Try Another User Account: Create a new user account on your Mac and check if the number pad works there. This step can help determine if the issue is user profile-specific - learn more.

7. Reset SMC and PRAM: Resetting the System Management Controller (SMC) and Parameter RAM (PRAM) can sometimes resolve hardware issues.
- To reset SMC: Shut down your Mac, hold down the Shift + Control + Option keys and the power button for 10 seconds, then release all keys and turn on your Mac.
- To reset PRAM: Restart your Mac and hold down Command + Option + P + R until you hear the startup sound twice.

If you have followed all these steps and the issue persists, it may be necessary to consult a technician for further diagnosis. - learn more.