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After deciding I wanted a set of C-rods for my child, I went back and forth about plastic vs. wood. Eventually, I decided on plastic, for the sake of durability. A mistake!
First, the good: These rods feel nice in your hands. The plastic is high-quality and solid.
Unfortunately, because of how the plastic rods are manufactured, they bulge out at the sides. Not a lot, just enough that you can't stack the rods on top of each other, and so that, crucially, eight one rods don't actually add up to one eight rod. Of course, a major reason for using C-rods is so a child can develop an intuitive sense that eight of these is exactly one of these, etc., so this is a pretty big concern.
For an hour or so, I thought I was overreacting, but my mathy spouse came home, started to play with our brand-new C-rods, and after about 30 seconds said "These don't work the way they're supposed to work." Alas. I'm going to return these and pick up a set of the wood rods. I've heard good things about the wooden Mathematics Made Meaningful set (unfortunately not sold by Amazon at this time... hint, hint.) and may try that one instead.
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This set surpassed my expectations. I had thought the plastic rods might be hollow: they are solid and have a nice feel in the hand. They don't come with much instruction, but the Internet is full of ideas about how to use them.Even better, our 9 year-old, who never met a math fact that stayed easily in his head, figured out right away how the blocks work and in five or so minutes, was making up his own equations: addition, subtraction, multiplication and division. He's very tactile and visual and as he worked a set of flashcards later, he went through them much faster and accurately than he ever has.
We'll definitely keep on with these--should be very good for him to "see" his multiplication and division facts too.


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