I get so fed up typing lots of numbers into my laptop while having to continually use the page up & page down keys that I sometimes carry around a separate Microsoft keyboard (£10 from PC World) that I plugged in. It makes typing in much easier as I can keep the number lock on all the time.
Going off topic, what I hate is the different keyboards you get in different countries - working out how to get an @ in some European countries, finding the A in a different location and so on. One hotel must have got fed up with guests asking about this and put instructions on their computer.