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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Checked with a mathematician.  He laughed.  Opposite is not a math word.  My 7th grader did not learn opposite as a math vocab word.  One can infer what it probably means (opposite linearly wrt zero).  [b]This is an example of some person who doesn't understand math making up a ridiculous question[/b].  That's all.  It doesn't demonstrate any mathematical knowledge whatsoever.  Again, guessing what the person who wrote the test wants you to say.

Wouldn't it be better to ask an arithmetic question or useful numberline question instead?  Something to demonstrate, does this child know how to add, or subtract, or move about the number line?  [/quote]

Some person who doesn't understand math, for example Sal Khan: https://www.khanacademy.org/math/algebra2/complex-numbers-a2/complex_numbers/v/complex-conjugates-example[/quote]

OK what is your point here?  I just wasted 4 minutes watching this video.  He says the numbers have opposite signs.  That is correct terminology.  If the question asked what number has the opposite sign that would be fine.  Asking what the opposite is without specifying with respect to what makes no sense.  Sure, many kids, maybe most, could figure out what the person who wrote the question wanted, but it's not mathematically correct.  Do you want your kids being taught and tested on knowing mathematical truth or that math can be anything you want?  [/quote]

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