It really is a genius-level show. I’m so happy it exists. Every detail is just perfect and both my kids love it and have learned so much from it.
It doesn’t hurt that it’s so entertaining they love watching it over and over, making it even more impossible to avoid committing its (very useful) memes to memory!
My kids were watching it at 5-6. But I believe they didn't understand that a staircase number is a sum or a rectangular is a product (they had to relearn that later in school).
"Young man, in mathematics you don't understand things. You just get used to them", John von Neumann
I think the show gave him an intuitive understanding of numbers and made basic math easy for him