Yeah , thats what i have meant. A photo of the touchpad. The reason i asked it because some of the touchpad's dont support numpad feature , but as i can see , your model does support.
Have you tried install this driver?
ASUS NumberPad Driver 220.127.116.11
(It seems i cant copy paste the url here , but go on google , type your model and enter asus website - under support you will find this driver)
Hope it helps.