Comment on I dunno

• MotoAsh@piefed.social ⁨1⁩ ⁨day⁩ ago

  True, but as with many things, something has to be the rule for processing it. For many teachers as I’ve heard, order of appearance is ‘the rule’ when commutative properties apply. … at least until algebra demands simplification, but that’s a different topic.

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  • SpaceCadet@feddit.nl ⁨1⁩ ⁨day⁩ ago

    something has to be the rule for processing it

    Well the rule is: any order goes. Summation is commutative.

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    • MotoAsh@piefed.social ⁨1⁩ ⁨day⁩ ago

      No, you completely misunderstood my point. My point is not to describe all valid interpretations, but the one most slow kids will be taught.

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    • Quatlicopatlix@feddit.org ⁨1⁩ ⁨day⁩ ago

      Yes thank you! If you have a sum it is really great to order it in a way that makes it better to ad in your head and i think that lots of people do that without thinking about it. X=2+3+1+6+2+4+7+5 X=2+3+5+4+6+7+1+2 X=5+5 + 10 +7+1+2 X=10 + 10 + 7+3 X=10 + 10 + 10

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• kuberoot@discuss.tchncs.de ⁨18⁩ ⁨hours⁩ ago

  If you have a bunch of unparenthesized addition and subtraction, left to right doesn’t matter.

  Right, because 1-2-3=3-2-1.

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  • howrar@lemmy.ca ⁨7⁩ ⁨hours⁩ ago

    You flipped the sign on the 3 and 1.

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