Laptops are small computers with a screen, keyboard and mouse in a tiny rectangle or a square if you are a lovely 4:3 user, usually around 12 to maybe 16 inches. (For non-imperial unit screen measurer people that's around the size of a banger and the neck of a giraffe when fully extended). They offer portability and are useful on you guessed itー your desk... top of your desktop (pun very much intended). or your lap!

Why is this important to know? Why is it important to know that the keyboard is integrated into the laptop and that it can go ontop of your lap and is relatively small? Why does it have to be centered?

Well, let's start with ergonomics (or lack thereof) and RSI: When laptops have a numpad, the main cluster is no longer on the center, it is on your left, which means when you are working on your lap, or god forbid, one handed, you're putting your 50-70 grams of actuation force on the left side of the laptop **AND ONLY THE LEFT SIDE OF YOUR LAPTOP**, your wrists are on the left side of the laptop, it's uncomfortable and hard to balance when required to balance! And this ruins other aspects of laptop ergonomics, like your trackpad, for the simple reason that your trackpad is centered to your spacebar or close enough and NOT the chassis of the laptop, this is so you can do tiny but quick movements with your thumb, it is useful especially when using very sub-optimal text editors, and one of the only benefits from a laptop and something that I wish even desktops did because it's a good and clever design but now misaligned. When you misalign these things, your hands and arms are no longer symmetrical and heavily off center, your back follows, and yet your screen is centered, Hello asymmetrical shoulder pain city, inhabitants: YOU. Ergonomically speaking, this is worse than my 11-inch Panasonic RZ4, something that is tablet sized.

The only ones that actually benefit from a numpad are accountants, and people who work with numbers a lot. The thing is, you never see them use a laptop keyboard, why is that? Because the numpads on laptops are TOO CRAMPED! They are too close to the main cluster, meaning you mistype a lot more, and are smaller than 1 unit, it's simply not big enough to be used as a numpad. Besides, those people work on desks, with oem desktop keyboards (full size, 101 keys) or use a seperate numpad because:
A. They are cheap (Cheaper than your starbucks dubai labubu chocolate flavored frappe, and probably tastes the same, seriously, that shit looks disgusting).
B. You can move them around your desk for it to be more comfortable for you, or maybe you find it more useful on the left side of your keyboard because you want to also be closer to your mouse for comfort.

Anyone who disagrees with this either doesn't use or hasn't used a laptop with a numpad for an extended amount of time per day for years, doesn't use the integrated peripherals of one, or does not know how to use a laptop, neither a keyboard properly. Please don't talk to me about keyboards if you require to look at the keys to find where the L key or if you are under 80 words per minute, because I bet the current keyboard on any machine you have is more efficient than you are, unless if you use this, do not complain to me:

More keys is not always better, and usually isn't, especially when not adjustable and in a limited space, people using a laptop will easily get used to not having a numpad: 80% more ergonomic for 20% of the effort. We are not forcing people to use a unix layout on a laptop where the backspace is actually the delete key, that would be actual INSANITY!

TLDR:
Laptop numpads are a compromise that ruins ergonomics for the majority in favor of a minority who already use external input devices.