Does some degree of rounding? Sure. The degree you present? I don’t want to pay for (ca) 5 pounds of meat with (ca) 4.6 pounds. And again, this is a deflection of the point of general communication/ common understanding.
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Replying to @Aya62335284 @perdricof
Yes, I understand that you think mathematical education is just a matter of telling kids how to punch numbers into the calculator on their iPhones and that any further thought about the relationship between those abstract functions and the real world is a woke waste of time
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Replying to @arthur_affect @perdricof
Sounds like a fun argument to have with a street vendor when purchasing food upon encountering less than careful rounding.
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Replying to @Aya62335284 @perdricof
It is only by having some understanding of this concept that you would have any basis for having the argument!
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My God I'm so fucking sick of conservatives ranting about "New Math" or "Common Core Math" as though the "good ol' fashioned cipherin'" they think is so important to teach kids isn't the *least relevant part of mathematical education by far*
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It has never, in history, been less important to be able to recite your times tables It has never, in history, been less important to be able to take out a piece of paper and perform long division by hand
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Even in the olden days before everyone was carrying a powerful computer with them in their pocket everywhere they went "Math errors" as the result of *conceptual* errors were far more common and damaging than actual arithmetic flubs
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Forgetting to carry the 1 while multiplying two numbers gets you a wrong answer within the same order of magnitude as the right answer Multiplying the *wrong two numbers* is a far more consequential mistake
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And the best way to build a foundation to avoid such errors is to start off teaching children to THINK To understand that mathematics, including even simple arithmetic, is a CONSTRUCTED TOOL Which is what all that newfangled nonsense about set theory and whatnot is about
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Replying to @arthur_affect @perdricof
That CONSTRUCTED TOOL creates a meaningful SHARED UNDERSTANDING
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Yes And it is VERY IMPORTANT that our society have a SHARED UNDERSTANDING that of the LIMITS OF THE TOOL
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It is therefore of GREAT SOCIAL VALUE for educators to talk about circumstances in which "2 + 2 = 5" might be true, and of NO SOCIAL VALUE to go on angry Ayn Rand rants about how people who deny eternal verities like "2 + 2 = 4" are heretics and anathema
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