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To find the origins of numeric keypads on computer keyboards, you have to reach back into the dawn of the digital computer itself. You will learn this using the "two keys at a time" method. This is not always very obvious though because the Mouse Keys feature is intended to be precise and allow for fine manipulation of onscreen elements, thus you should always check for the setting when troubleshooting the matter.The keyboard has a backlit display. The most obvious indicator that Mouse Keys is the reason the numeric keypad is not working is that when you type a number, the mouse cursor moves very slightly, thus if you try to type a bunch of numbers the mouse cursor on screen may seem to jiggle around a bit in a small area. Select “Mouse & Trackpad” and look for an option called “Enable Mouse Keys” – uncheck this if it is checked to regain usage of the number pad.Open  Apple menu and choose “System Preferences”, then go to “Accessibility”.This setting is called Mouse Keys, which allows a user to control the onscreen cursor using the number pad on an extended keyboard. If you tried Clear and Shift+Clear to no avail, you probably have a setting enabled in the accessibility options of OS X that is preventing the numeric keypad from acting exclusively as a means of typing numbers. Numbers Still Not Typing? Check for Mouse Keys

Try both of those separately, and then try to type numbers using the numeric keypad again, this should resolve the issue in most cases. You may need to hit Shift+CLEAR instead, depending on your individual keyboard and settings. However, you can achieve the same function by hitting the CLEAR button on the numeric keyboard. There isn’t a dedicated Num Lock key on the Apple Wired Keyboards, and that applies to many of the third party USB keyboards built for Macs too. Where is the “Num Lock” Key on a Mac Keyboard?

It can also be helpful to summon the onscreen virtual keyboard on the Mac to make sure the key presses are registering as intended, though this is mostly for visual affirmation and not necessary for troubleshooting. You’ll likely want to open a text editor app or be somewhere that you can enter numbers and text freely while you troubleshoot this issue, chances are that you’ll have it resolved momentarily but you’ll still want to double-check by typing on the number keyboard to insure things function as intended.