this post was submitted on 17 Jul 2024
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Showerthoughts

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Amazon should've made Prime Day fall on a date corresponding to an actual three-digit prime number. (sh.itjust.works)
submitted 4 months ago* (last edited 4 months ago) by booly@sh.itjust.works to c/showerthoughts@lemmy.world
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Amazon is running a Prime Day sale on July 16 and 17. Setting aside the fact that this is two separate days, neither 716 nor 717 are prime numbers. They should've done 7/19 instead.

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[โ€“] Audacious@sh.itjust.works 2 points 4 months ago (1 children)

Back in the olden days before digital calculators, people had tricks like that to help them do mental math.

[โ€“] FeatherConstrictor@sh.itjust.works 1 points 4 months ago

๐Ÿ˜‚ 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