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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]The way I explained it to my kid was that 
(1) the teacher didn't actually need to know the answer to the problem.  They need to know whether the kid understands the math.  If you do it in your head and make a mistake, the teacher doesn't know whether you understand or whether you just made a careless mistake. They can't see where you went wrong.
(2) At some point, you won't be able to do the math in your head.  The numbers will be too big or there will be too many steps.  Best to get in the habit of showing your work.
(3) You can get partial credit if you show your work.  [/quote]

This is the most important response. The problem is that with homework, teachers want showing work to include steps and no shortcuts on like 100 problems in hand writing and that's just for one class on one assignment. It's tedious. Especially for somebody who's not making those mistakes.

I remember when we first learned system of equations and would get 20 problems a night and I wouldn't do them and I'd get in trouble. I knew the material and Aced the tests. That's all that mattered. [/quote]

You didn’t ace the tests if you didn’t show your work.[/quote]
Why don't you re-read the part where PP said they aced the test?[/quote]

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