It doesn't come with the separate keys also that normally are part of the separate number
key pad on an external keyboard, correct?
Dell uses some of the other keys for it on the new Dell XPS Laptop: your Fn+F12,
End, would be 1 on a separate number pad on an external keyboard depending on the
NumLock state.
Maybe you can test it next time with the On-Screen Keyboard in Settings > Ease of access > Keyboard opened (this can mirror some pressed keys). Select the
Options key, then put a check with Turn on numeric key pad. The
NumLock key appears in the bottom right corner of the On-Screen Keyboard. Click that to turn on
NumLock and use the keys to check? (This may be of interest to you for some future use.)