How turn on numlock, MacBook Pro, OS X 10.11.5?

MacbookPro, Retina, 15 inch. mid-2015, 2.8 GHZ Intel Core i7, 16 GB, 1600 Mhz DDR3.

Is there a way to turn on numlock? Keyboard doesn't have one, on previous late-08 MacBook Pro I could do it using F6 key and something else I don't remember, that doesn't seem to work on this computer.

If not, how would I ask Apple to provide a solution?

Thank you.