How Do I Change Keyboard Back From Tenkey On Laptop?

There's usually a special key somewhere around the top of the keyboard that locks the keyboard into num-pad mode. It might be a combination of your 'Fn' key and one of the 'F' keys along the top, or it might just the the 'Num Lock' / 'Num Lk' key.

If this doesn't help, tell me what model of laptop you have and I'll find out for you.