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[–] 2 points 7 months ago (1 child)

As a math teacher, my suggestion to the students is during practice to try to do calculations without a calculator to invoke a bit of number sense so when they use calculators be able to notice in the result if they did a wrong input. It happens to input "14" instead of "41" . I feel like able to do mental arithmetic with double digit numbers can be helpful

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  • [–] 1 point 7 months ago* (last edited 7 months ago)

    In hindsight, I do think the right approach is not to use calculators till secondary school (about 14~15 years of age). Having a feel for numbers and how they should behave under addition/multiplication/exponentiation and ability to mentally do two digit calculations as you said is critical, and should be an "automatic" capability

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