Example with image: https://andrew.kvalhe.im/2021-03-19
With this method you can customize the location and surrounding mathematical operators.
It's an impoverished numpad that requires different muscle memory that you probably don't use often enough to master.
Personally I never use the virtual numpad on my devices, I use the full numpad if available or I usr the top row of number keys.
I did buy a wireless numeric keypad at one time that had some extra keys and arrows that made data entry really fast.
The "5" key on most numpads has a bump so I can reach it without even looking at a keyboard I'm familiar with. Any 4-digit security pin I use is entered from numpads.
I always buy a laptop with a numpad. Its my preferred method of typing numbers. There are also a whole slew of video game applications, as well as Blender movement (camera angles, camera movement, etc. etc.) that's highly intuitively mapped to the numpad.
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I should note that when I was practicing for the video-game community "Blazblue", all movements were discussed in terms of numpad. 236 is quarter-circle forward. 69874123 is "360-degree circle, counterclockwise, starting with right".
Needless to say, typing a combo such as 5b 5c 2d 28d 28 b c b 8 b c 236c 2d was much easier with a numpad.
Anyone who wants to "decode" the button pushes only needs to look at their numpad to see how their left-hand should move, with "b, c, d" being the keywords for the right-hand buttons in Blazblue. Street Fighter players use lp, mp, hp (light punch, medium punch, heavy punch) instead. So those bits get game specific, but the numpad approach to discussion is basically considered superior.
The bump on the j-key on the keyboard, and the 5-key on the numpad is very much clear to high-speed typing.
On keyboards without bumps, I find myself off-aligned. Instead of typing "jumping jellyfish", I type "hynoubg hekktfusg", and have to realign my hands.
Could I do it without the bump? Probably. But having the bump there (both the j-bump and the 5 bump) is very useful at preventing this mistake.
I suspect the utility of a numpad is increased while the off center problems are decreased for touchtypers which is why there is such a divide.
Ah? I would have thought the opposite. I cannot touch-type at all (and you could promise me a million dollars reward, I still wouldn't manage), nevertheless there is one part of the keyboard I can use without looking, and it is the numpad. Possibly because it is a limited area with a limited number of keys, and the numbers are placed in a "logical" order (compared to letters on the main part of a keyboard).
I am bad at entering numbers on the top row, a I am forced to do on most laptops (and unfortunately, I personally find the pseudo-numpad, which requires using the Fn key or similar, utterly unusable; I never could get used to it).