you forgot the one i use the most often - there are 12 months in a year.
how many times do you calculate "X per year" in your head? i do it multiple times per day, and not just at work.
how many times do you calculate "X per year" in your head? i do it multiple times per day, and not just at work.
Seldom enough that I 'calculate it in my head' (as your comment suggests you do too) rather than memorise the 12x table.
But then again I grew up in metric country that only bothered with drilling kids up to the 10x table at school. Never had to worry about feet to inches conversions very often either.
Meanwhile, reviewing my post it reminded me of my US History teacher in middle school telling me that the Conquistadors in the Americas were after the 5 Gs: Gold, Gold, Gold, God, and Glory. I listed five things: Time, Time, Time, Degrees and Factors. I'd be thrilled if someone could say the same thing but with all of the words starting with the same letter.