I accept that there's no answer that YOU could possibly give, but I could certainly explain it to your kid for you.https://twitter.com/soncharm/status/1128787224542232583 …
that, or you need to ask the kid what method he used which the teacher did and the kid gave the wrong answer
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but the point is that this /doesn't/ teach the kid how to estimate and why estimation is valuable it teaches the kid that sometimes the teacher will ask you a math problem and then mark you off for getting it right, probably out of sadism
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agreed it doesn't teach it it's a test the purpose of tests is to verify knowledge, not to impart it
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