re: (Not Common Core)-- Why are they teaching math this way?

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The point is the word was not taught as a vocabulary word. The meaning was not taught in class.

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His teacher either made a mistake, has faults, is generally bad, or he didn't listen. In any of those instances, teach him the meaning. But I agree, it's probably one of the first three out of those four choices, and that's hard to deal with- it's an unreal expectation and one of the major reasons the education system sucks. The kids don't know what it means. Most parents don't know what it means. And the teacher doesn't teach the meaning of it because she's never done it before and wasn't told to do so. The kids with parents who explain it are well off. The kids who don't have parents who do homework with them are either smart enough to figure out the most algebra on their own or screwed.