My husband and I were talking about multiplication the other day and I let slip that I don't have my upper times tables memorized. 5 is about as far as I go.
"So how would you multiply 7*9?"
I answered that I'd do 4*9 and then add it to 3*9. Or I might use the ascending/descending pattern of the 9 times table and count down - 9*9=81, 9*8=72, so 9*7=63 He looked at me like I was crazy.
I probably could memorize the upper tables but I never bothered and this method doesn't seem like much extra trouble to me.
I'm wondering who out there has the tables memorized and who uses tricks or alternate methods?