My laptop doesn't have a separate keypad, either, or a number lock key.
What I have to do is press Function-F11, which turns on a number lock light. Then I can use the JKLUIO789M keys as a number pad, and they are labeled that way in a different color.
When I'm finished, I press Function-F11 again, which turns this feature off.
It is annoying to use for most purposes, because you lose the ability to type those letters while number lock is on... but if you're playing a game, you may not need those letters.