If a numeric keypad doesn’t work on Mac
A numeric keypad is an extended layout of additional keys, including numbers, to the right of a regular keyboard. The 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 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, click Pointer Control, then click Alternate Control Methods.