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Re: [Phys-L] problems with the teaching of algebra

On 10/11/2014 8:43 PM, Bernard Cleyet wrote:


Aaaagh!

You’re correct, however, this practice exam. includes one, I think — at least I used algebra , #22

‎www.ctcexams.nesinc.com/pdf/cbest_opt_math.pdf <http://www.ctcexams.nesinc.com/pdf/cbest_opt_math.pdf>

The problem is:

At the beginning of a class period, half of the students in a class
go to the library. Later in the period, half of the remaining
students go to the computer lab. If there are 8 students remaining
in the class, how many students were originally in the class?


It is interesting to note that Singapore students are expected to solve such problems in the third grade with their bar models.

Ze'ev