Apple Magic Keyboard with Numeric Keypad: number keys on keypad do not work
Anyone know how to get the Numeric Keypad to work? - this keyboard does not have a numlock button.
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If you're using it in Windows, the Clear key (above 7 on the numeric keypad) acts as NumLock.
If you're using macOS, you may have enabled Mouse Keys. Try pressing the Option key five times, or check for Mouse Keys in the "Mouse & Trackpad" section of Accessibility system preference.