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Topic: Common Core snippet a little distressing
Replies: 73   Last Post: Jul 26, 2013 6:27 PM

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 Christian Baune Posts: 1 Registered: 7/15/13
Re: [Math 2.0] Re: Common Core snippet a little distressing
Posted: Jul 15, 2013 10:08 AM
 att1.html (3.3 K)

Simple exercises :
A)
How many tetrahedron in a 10x10x10 tetrahedron ?
How many cubes in a 10x10x10 cube ?

B)
Jhon has 600 tetrahedric brics of side 1,2,3 in the reverse proportion (300
of unit side, 200 of bi-unit side, 100 of tri-unit side)
He want to fill in a tetrahedric wall with a side of 100u³, how many brics
will he break at minimum ?
Same for cubes.

Try it, conclude.

2013/7/15 Robert Hansen <bob@rsccore.com>

>
> On Jul 15, 2013, at 9:55 AM, kirby urner <kirby.urner@gmail.com> wrote:
>
> I'm saying that the tetrahedron may also be used as a model of 3rd
> powering i.e. you have a dial you rotate clockwise / counter-clockwise to
> boost-diminish the edge sizes of a tetrahedron from between 1 and 3. The
> thing grows and shrinks from volume 1 to 27 and every value in between, and
> its volume is precisely a 3rd power of the edge length. Why? Because we
> *define* a unit edge tetrahedron to have volume 1. Can we do that? Yes.
>
> Is there a reason to *never* show this in the classroom? I'm saying the
> Common Core gives us an opportunity to brand curricula as not just
> "aligned" but extending "well beyond".
>
>
> I suspect the reason is that it is contrived and doesn't make and sense.
>
> Bob Hansen
>
>
> [1] contrived: deliberately created rather than arising naturally or
> spontaneously.
>
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>

Date Subject Author
7/13/13 Peter Duveen
7/13/13 Robert Hansen
7/13/13 kirby urner
7/14/13 Robert Hansen
7/14/13 kirby urner
7/14/13 Robert Hansen
7/14/13 kirby urner
7/14/13 Robert Hansen
7/14/13 Robert Hansen
7/14/13 kirby urner
7/14/13 Robert Hansen
7/14/13 kirby urner
7/14/13 Robert Hansen
7/15/13 kirby urner
7/14/13 Wayne Bishop
7/14/13 kirby urner
7/14/13 Wayne Bishop
7/15/13 kirby urner
7/15/13 Robert Hansen
7/15/13 Christian Baune
7/15/13 kirby urner
7/16/13 Wayne Bishop
7/16/13 kirby urner
7/14/13 Wayne Bishop
7/14/13 Joe Niederberger
7/15/13 Joe Niederberger
7/15/13 Joe Niederberger
7/15/13 Robert Hansen
7/15/13 kirby urner
7/15/13 Robert Hansen
7/16/13 kirby urner
7/16/13 Robert Hansen
7/17/13 kirby urner
7/17/13 Robert Hansen
7/17/13 kirby urner
7/17/13 Robert Hansen
7/17/13 kirby urner
7/15/13 CCSSIMath
7/16/13 Joe Niederberger
7/16/13 Robert Hansen
7/16/13 kirby urner
7/17/13 Joe Niederberger
7/17/13 Robert Hansen
7/17/13 kirby urner
7/17/13 Robert Hansen
7/17/13 kirby urner
7/17/13 kirby urner
7/17/13 Robert Hansen
7/18/13 Wayne Bishop
7/17/13 Joe Niederberger
7/17/13 Joe Niederberger
7/17/13 Robert Hansen
7/18/13 Wayne Bishop
7/18/13 Joe Niederberger
7/18/13 kirby urner
7/18/13 Joe Niederberger
7/20/13 kirby urner
7/19/13 Joe Niederberger
7/19/13 kirby urner
7/19/13 Joe Niederberger
7/19/13 Joe Niederberger
7/20/13 kirby urner
7/21/13 Joe Niederberger
7/23/13 kirby urner
7/24/13 frank zubek
7/24/13 frank zubek
7/24/13 kirby urner
7/25/13 frank zubek
7/25/13 kirby urner
7/25/13 frank zubek
7/25/13 frank zubek
7/25/13 frank zubek
7/26/13 frank zubek
7/26/13 frank zubek