They do exist, though I dunno if you’d find any examples online

But they suck for most uses because there aren’t number words.

Like, in print or cursive, the word “pool” exists as a distinct combination of letters that can be recognized even with sloppy writing. I’m using that as an example because I’m dyslexic and that’s one of my favorite examples of how I manage to read as fast or faster than someone that isn’t.

However, 1984, 1776, 2025, they don’t necessarily have the same “weight” in memory where you would recognize them if the numbers are connected.

And with math connected numbers would be a shit show from top to bottom.

So there’s really no use case for learning connected numbers. They aren’t useful, and cause problems. Why learn Cyrillic if you never run into books printed in it? Even that would be a more useful thing to teach in schools than connected numbers. There’s no good reason for connected numbers except for private notation. Even then, you’d not save much time unless you’re writing a shit ton of numbers, and you’d better be able to practice both doing them and reading them if you want those notes to be useful later.

Afaik, nobody uses them at all nowadays. For anything. So finding instructions on how to do it isn’t likely online (though I’m going to check just out of curiosity and edit in if I find it). It would be unlikely to find any of the old texts that teach it even in a decent book collection.

Couldn’t find any, but decided to do an example from memory

As you can see, even discounting my shitty skills in writing on screen, there’s some serious issues with reading connected numbers.