This simple-looking sum went viral because people have so many different ways of doing it

In the first (only) of an occasional new series, mental arithmetic of the week, comes this question posed by @PrettyboiiDB_9 on Twitter.

And it went viral because people had so many different ways of doing it.

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When did addition get so complicated?

We’re with Caitlin Moran.

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This simple enough maths question has divided the internet and people are getting angry

Source Twitter @PrettyboiiDB_9