OS X Yosemite: If the numeric keypad doesn’t work
The numeric keypad works in different ways, depending on your Mac, and the keyboard and app you’re using. Usually you use the numeric keypad to enter numbers, but you can also use it to move the pointer and, in some apps, to move around your document.
Press the Num Lock key.
If you have a separate numeric keypad on your keyboard, the Num Lock key is located in the numeric keypad. If you’re using a portable Mac, Num Lock is sometimes a function key, marked Num Lock. If your keyboard has a separate keypad but no Num Lock key, try pressing Shift-Delete.
If the numeric keypad still doesn’t work as you expect, you may have enabled Mouse Keys, which lets you move the pointer with the keypad.
To see the option that turns off Mouse Keys, choose Apple menu > System Preferences, click Accessibility, then click Mouse & Trackpad.
Most portable computers have a group of keys on the keyboard that can function as the numeric keypad. To find the keypad, look for small numbers or symbols in the lower-right corner of keys on the right side of your keyboard. Press the Num Lock key to turn on the keypad. The green light glows on the Num Lock key when the keypad is active.