What should I do if I cannot enter numbers with the numeric keypad?

• Check if the Num lock indicator light is on or off.
  When the indicator light is on, you can enter the numbers printed on the keys.
  When the indicator light is off, you can enter the letters and symbols printed on the keys.
  Press the Num Lk key, or Fn+Num Lk keys, to turn the Num Lock indicator light on or off. [Details]