These multiple choice tests at schools are quite curious to me as a German. The first time I have seen multiple choice question in a test was at university, and then only in one course by a professor with a huge affinity to the U.S.
When given the "Mario sells 80 pencils a day from his supply of 1,000 pencils." question, pupils here have to write down how they got to the solution, even if they could calculate it in their head. You got only part of the points if you did not provide the process. At later grades, this also allowed for different approaches, and you would get at least some points if you made a mistake in a step and got the wrong solution.