LoL, thanks for sharing the memories all. For me, we kept playing intellivision regularly until the mid 90s when I could finally afford a Sega Genesis. So, when off on Christmas Break from school we got to load up on games. My dad got me into the system. His way of teaching me to 'figure it out' was that he would never teach me how to play a game. With no internet, if we were missing the overlays I had to play solo to figure the game out.
But before we could play that afternoon during break he would make us watch 'Power Lunch' on TV with him- lunchtime rundown on stock market movements. I got pretty good at math. Back then stocks were still in fractions of a dollar, based on the old 8 Reales coin = 1 USD at the founding of the USA. Stocks were sold in 1/8 of a dollar, down to 1/64th if I recall correctly.