Powderhorn@beehaw.org to Technology@beehaw.orgEnglish · 3 days agoThe Math Hack You Didn’t Know Was in Your Credit Cardwww.scientificamerican.comexternal-linkmessage-square7fedilinkarrow-up137arrow-down14file-text
arrow-up133arrow-down1external-linkThe Math Hack You Didn’t Know Was in Your Credit Cardwww.scientificamerican.comPowderhorn@beehaw.org to Technology@beehaw.orgEnglish · 3 days agomessage-square7fedilinkfile-text
I’ve been familiar with the concept, but this is by far the best behind-the-scenes explanation I’ve seen.
minus-squarecmnybo@discuss.tchncs.delinkfedilinkEnglisharrow-up5·3 days agoThe check digit is to catch a mistyped number.
The check digit is to catch a mistyped number.