# Singapore 4B question...

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Okay, I've seen mention of "rods" in regards to how Singapore teaches math...but we're all the way to 4B and I haven't seen mention of "rods" anywhere in the texts, yet there are questions that need to be answered either with "rods" (from looking at the other Singapore 4A question posted earlier) or algebraically (which my 4th grader is not ready for yet).

Does Singapore come out at some point and explain this "rods" concept or are we just supposed to 'pick it up' on our own? I've grown frustrated because as we work through the challenging word problems there are many many instances where I just don't know how to explain it to him in non-algebraic terms...it looks like I need this "rods" concept, but it hasn't been introduced anywhere in Singapore and I've not learned it prior.

Did I miss something?

Thanks

Angela

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I'm guessing it is probably in the Home Instructor's Guide (seen them at Rainbow Resource Center and other places too) however, I don't use the HIG so it is just a guess.

Within the SM books, bar diagrams (picture version of rods) begins in the 3A textbook pictures. Then you can either draw those bar diagrams and things or build them with rods or blocks if you want to.

Well, in some ways the bar diagrams began in concept in 2A/2B when you cut segments of rope pieces and things like that.

-crystal

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If you're using CWP, the beginning of each chapter has some worked problems that show how to use the bar method. I think we really started using the bars in 3A.

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I am familiar with the "rods" concept because I have also used Miquon. According to the responses to my (4A) question the Home Instructor's Guide does give more detailed lesson plans. I plan to start ordering them.

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I thought the rod concept started back in the level 2 books somewhere, but I'm not exactly sure now. I don't think they're ever termed "rods" in the books. They just show you diagrams using bars, or rods, as many of us call them, to work the problems.

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The actual use of rods starts in 2A/2B and in the CWP. They use the term "bar" diagram so it's not actually "rods". It's drawing the bar diagram so they learn how to place value to an unknown unit, using basic algebraic functions.

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The concept is bar diagrams. Bar diagrams are taught in 3A.

Sincerely,

Karen

http://www.homeschoolblogger.com/testimony

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