Back of the envelope means you can estimate so you don't need it memorize the wh... | Hacker News

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		lupire on Feb 4, 2022 \| parent \| context \| favorite \| on: Why are mathematicians so bad at arithmetic? (2017... Back of the envelope means you can estimate so you don't need it memorize the whole table.

mdp2021 on Feb 4, 2022 [–]

You need those key→value promptly available when you are actually performing the "back of the envelope" computations.

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