How to enable or disable the Integrated Number Pad on a Laptop Keyboard
A lot of laptops today don't necessarily come with an actual numpad. You'll find that the numpad keys are shared with the numbers 7, 8, 9, and the letters U, I, O, J, K, L and M, as illustrated below.
In order to use it, you have to press the fn + num lk together. You will then see the little light above num lk light up. After you do this, you will be able to use the numpad for the numbers instead of the letters.
When you're finished using the numpad, again click fn + num lk together, making sure that the light above num lk goes out. Now you'll have the use of the letters again.
To find out how to use the keypad for ascii characters, click here for the instructions.
If you find that your keyboard seems to be typing the wrong characters and basically acting up, your problem might be that you accidentally pressed certain keys that activated another keyboard mode. Click here for the instructions to change it back to normal mode.