Thanks to "Pyramid," I learned how to spell and pronounce "hors d'oeuvres," as well as an introduction to three-digit addition (even at a very young age, I wanted to be quicker than Dick Clark adding up the boxes in the Winner's Circle).
WOF taught me multiplication, and I got a crash course in counting by hundreds the "Jack Barry way" on TJW.
SOTC was good when it came to subtraction, particularly with Instant Bargains.
When she was 4-5, my daughter started getting comfortable with the concept of taking letters and putting them into words after showing her a few episodes of "Countdown" on YT (she was in what my family called her "British stage," where she watched UK kids shows on YT and spoke in British colloquialisms -- "Ready, steady, go … let's take the lift, etc.".)
JD