Скачать или смотреть Internet Shocked By Teacher's Answer

A child's test has gone viral because people cannot believe the teacher marked this student's answer wrong. But objective observers note this is exactly what is being taught in school, and has a long history in math for thousands of years.

Reddit
  / sons_math_test  
askmath
  / arent_they_the_same  
theydidthemath
  / requesti_have_gotten_into_an_argument_over...  
Official common core standards
https://corestandards.org/wp-content/...
Khan Academy - multiplication
https://www.khanacademy.org/math/cc-t...
https://www.khanacademy.org/math/cc-t...
Multiplication
https://en.wikipedia.org/wiki/Multipl...
5x3 is wrong video
   • Controversial math problem. Why was 5x3 = ...  
Euler Elements of Algebra originally published 1765
https://www.google.com/books/edition/...
https://en.wikipedia.org/wiki/Leonhar...
Euclid Elements Book VII (around 300 BCE)
http://aleph0.clarku.edu/~djoyce/elem...

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