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You didn't say which NUC model you have.
In most NUCs, go into BIOS Setup (Visual BIOS, by hitting F2 while splash screen is displayed during boot), click on Advanced then Devices and Peripherals and then on the On Board Devices tab. In the right-hand Legacy Device Configuration box, you should see a parameter labelled Numlock (or Num Lock). If this is checked, NUMLOCK will be on during boot (though some O/Ss will reset this feature as they are started)
Hope this helps,