Pam
Posts:
1,507
Registered:
12/6/04


Re: Simplifying Algebraic Expressions with Subtracted Expressions
Posted:
Nov 15, 2013 11:06 PM


Posted: Nov 15, 2013 7:47 PM by Robert:
> > With that limited interpretation, do you think the > student would even put a dent in this exam... >
I do believe I understand where the limited interpretation is coming from ...
> http://www.hannahtuition.com/tag/psleproblemsums/ > > Here are 6th grade preliminary exams and solutions > from top schools in Singapore... > > http://tamilcube.com/singaporemath/P6exampapers/2011 > _anglochinese_P6_mathematics_prelim_exam.pdf > http://tamilcube.com/singaporemath/P6exampapers/2011 > _HokkienHuayKuan_P6_mathematics_prelim_exam.pdf > http://tamilcube.com/singaporemath/P6exampapers/2011 > _NanHua_P6_mathematics_prelim_exam.pdf > ... >
Exactly. This is what students studying the Singapore curriculum are prepared for. And note all that convenient space for each problem  plenty of room for drawing some bar diagrams!
You should spend some time with bar diagrams  you just might discover what a powerful tool they are for promoting algebraic thinking, for children in the prealgebra stage. In some ways, it is what the Singapore textbooks are all about  developing a more and more sophisticated and flexible ability to use bar diagrams to solve more and more sophisticated problems. Problems that are not accessible to 5th and 6th grade students learning from other curricula.
> If so, then why > don't people solve problems this way professionally? > We've all been in banks and I work with finance and > accounting departments at numerous corporations, and > no one solves problems this way, and they deal with > arithmetic and circumstances far more complex than > these problems.
Well! The next time I see a 5th or 6th grade employee in a corporate finance and accounting department drawing a bar diagram, I will be sure to clamp down on that, gosh darn them!!
Pam

