Asus T300LA - Manual (Page 45)

Notebook PC E-Manual 
Press to toggle between using these keys
as number keys or as their original keyboard function.
Numeric keypad on keyboard*
This Notebook PC comes with 1 select keys that you can also use for
numeric input.
The numeric keypad on your Notebook PC are 1 select keys that are
originally part of your standard QWERTY keyboard. Using the function
key, these select keys can become a numeric keypad on your Notebook
PC.