Enable numeric Num Lock mode
Turn Num Lock on when the keypad should enter digits.
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Restore numeric keypad input by checking Num Lock, embedded laptop layers, and Mouse Keys.
If 8 moves the caret up and 4 moves it left, the keypad is operating in navigation mode rather than losing key events.
Press Num Lock once and observe its indicator or On-Screen Keyboard state.
On compact laptops, use the exact model’s documented Fn/Num Lock control.
Open Accessibility → Mouse and confirm whether Mouse Keys is enabled.
Enter all ten digits and decimal/operator keys.
Turn Num Lock on when the keypad should enter digits.
Use the model-documented Fn combination on compact keyboards.
The keypad intentionally shares numeric and navigation functions selected by Num Lock.
Microsoft Support. On-Screen Keyboard and keypad state diagnosis.