
Re: [Math 2.0] Re: Common Core snippet a little distressing
Posted:
Jul 15, 2013 10:08 AM



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 biunit side, 100 of triunit 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 / counterclockwise to > boostdiminish 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. > >  > You received this message because you are subscribed to the Google Groups > "MathFuture" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to mathfuture+unsubscribe@googlegroups.com. > To post to this group, send email to mathfuture@googlegroups.com. > Visit this group at http://groups.google.com/group/mathfuture. > For more options, visit https://groups.google.com/groups/opt_out. > > >

