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 …
if you want to teach estimation, you need a classroom session dedicated to it, with multiple examples on the chalkboard this image was of a test a test, not a chalkboard so why are you criticizing the test for not being a good lesson?
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I would say the test is not a good test, if applied to people who can do the calculation in their heads, because it doesn't illustrate the utility of the technique; it asks you to get a worse result than you could for no obvious reason
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quite plausibly this whole issue is from smart kids getting stuck in +0SD classrooms; it's certainly activating a bunch of my old grievances
End of conversation
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