• hydroptic@sopuli.xyz
    link
    fedilink
    arrow-up
    4
    ·
    1 year ago

    Yeah I think this is more about how you interpreted it, because it doesn’t look like others took it as being an absolute magic trick rule and neither did I.

    The Panzer of the Lake didn’t use the word “commutativity” (fuck that really is hard to spell), but it gave out some wisdom that applied that rule by saying that “percentages are reversible”: if the reverse of a percentage would be easier to calculate, you can use it and get the same answer. If it’s not easier, well, then you’re screwed 😁 Oooooor depending on the situation you can use the a × b% = a × b / 100 commutativity trick:

    7 × 8% = 0.56

    7 × 8 / 100 = 0.56

    • TAYRN@lemmy.world
      link
      fedilink
      arrow-up
      4
      ·
      1 year ago

      Oh, that is actually much more helpful. So, if you know your times tables, you can do percentages. You just have to use communitavatization.

      Jokes aside, I really appreciate it. That made it much more easier to understand. Thank you.

      • hydroptic@sopuli.xyz
        link
        fedilink
        arrow-up
        2
        ·
        1 year ago

        You’re welcome! Glad I could give you an a-ha moment.

        Having an intuitive feel for tricks like using the definition of operators or symbols to make your life (well, calculations at least) easier usually means that you either have to just be “naturally” talented at math which is really rare, or you’ve just had to grind grind grind math at eg. university, work or whatever. So unless someone was taught that above trick and they actually remember it from school, they might never come to think that “hmm % just means / 100 so that can make this easier to figure out in my head”.