The internet is torn over an elementary-level math equation which left many scratching their heads. The viral math problem has X users stumped - but the answer comes from lessons learned in fifth or ...

"The kid starts cackling, and I realise he invented his own question in order to trick me into saying it," the teacher wrote.

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The parent believed the question was poorly written and should have been multiple choice if limited responses were desired.

Much of the way math is taught was developed before we had neuroscientific insight into how the brain actually learns.