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Nurturing the Years of Wonder
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lapazfarm
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Posted: May 29 2007 at 4:09pm | IP Logged Quote lapazfarm
Question 1: I don't get it. What are the "arrows" all about that go with the colored bead chains?
Question 2: What is the "decanomial" stuff and how is it used?
Argh! my head is spinning!



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Meredith
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Posted: May 29 2007 at 5:06pm | IP Logged Quote Meredith
Oooh, this is probably my most favorite Montessori Math Material!! It's so cool. The Decanomial can be considered for Sensorial or Mathmatical abstraction. The layout of 55 of each of the colored bead bars from 1 to 10 forms the decanomial. If you have looked at the "Dot Game" I'm pretty sure this follows the Decanomial Layout only on paper. Here'sJMJ's layout for the Bead Decanomial

Here is a nice explanation at JMJ Publishing scroll down to Multiplication Equations and you can see the geometric layout! Also,here's a photo of a young person in action working the Decanomial with Cuisinaire Rods

I printed all my Arrows from JMJ and they are very helpful in *Marking* your place when doing the bead work. Seamus (ds 5) has used them most recently for counting by 10's to 100. We use an arrow for each ten. It's a really nice visual for them and they can see the numeral in action as they are manually doing the counting with the rods/beads.

Does that help somewhat?? Anyone else with experience with this one?? I can't wait for me colored Decanomial Beads to arrive as I know these will be a hit for all my ages!!

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Celeste
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Posted: May 29 2007 at 5:09pm | IP Logged Quote Celeste
As I understand it, the arrows are the multiples. E.g., the hundred chain will have ten gold arrows marked 10, 20, 30, etc., up to 100. The nines will have the multiples of nine. And so forth, and all the rest.

Their direct aim is skip counting; indirectly the child learns multiples up to the square, and somewhat the concept of multiplication.

(I asked my resident experts, the kids who are still in Mont. school!)

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