Archived Oklahoma school finds 98 year old drawings and lessons hidden behind old chalkboards (imgur.com)
submitted ago by mistraval
Posted by: mistraval
Posting time: 5.5 years ago on
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Archived on: 2/12/2017 1:51:00 AM
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Archived Oklahoma school finds 98 year old drawings and lessons hidden behind old chalkboards (imgur.com)
submitted ago by mistraval
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[–] 2716057 0 points 1 point 1 point (+1|-0) ago
Okay, so I've taken several years of university-level calculus, and I have NO idea how that multiplication table works. I've been trying to decipher it for about an hour, and I just feel frustrated and dumb.
Anyone care to explain it to a simple man?
[–] SenorFranco ago
Same boat. I think it has to be a teaching aid instead of a multiplication tool.