SETS!
I guess I may be one of the lucky ones. When I started public school, in 1966, our school district had adopted a math teaching method involving "sets."
Everything about math was being taught visually. We were taught to add sets of lemons and oranges, or puppies and kittens. There might be several sets of lemons, several sets of oranges, several sets of puppies, and several sets of kittens.
We'd have to answer questions like:
How many [kittens, puppies, lemons or oranges] are there?
How many fruits are there?
How many animals?
How many living things?
They would use sets for addition, subtraction, multiplication and division. I ACED math because of it.
Later on, I moved to a different district that didn't use visual techniques for math. I did okay for a while, but stopped liking math. When I got into algebra though, all of a sudden I could see the connection between sets and algebra, and I started doing a hell of a lot better.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...