Comment on Amazon should've made Prime Day fall on a date corresponding to an actual three-digit prime number.
Audacious@sh.itjust.works 3 months agoBack in the olden days before digital calculators, people had tricks like that to help them do mental math.
FeatherConstrictor@sh.itjust.works 3 months ago
😂 I’m familiar with many of them because I liked math in school and went through all of primary and middle school without a digital calculator. This one is one I hadn’t heard of before and, again because I like math, I’m interested in understanding 1) what the trick is and 2) mathematically how it works out