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Topic: Re: Not in Boston
Replies: 28   Last Post: Apr 12, 1999 12:52 PM

 Messages: [ Previous | Next ]
 Mark Priniski Posts: 10 Registered: 12/6/04
Re: Manipulatives
Posted: Apr 11, 1995 8:12 AM

Hi NCTMers---

>For older kids -
>When I teach trig, I give my students large unit circles on graph paper
>with a radius of ten graph units of .1 each. They approximate the
>coordinates of the points on the circle at the intersections of the radii
>at pi/6, pi/4, ... etc and write these on the circle. From then on they
>can visualize the important symmetries by referring to the circle and
>they use the circle on tests and in doing work involving trig for several
>years afterward. For these kids the unit circle is a manipulative - they
>depend on it, not for values (they have calculators for these if
>necessary) but for visualizing and understanding the nature of circular
>functions. A kid who doesn't happen to have her circle available will
>often sketch it quickly when working on a problem - which is exactly how
>I would hope she would think
>
>Joan Reinthaler
>Sidwell Friends School

Here is one I used this year...

My Algebra II class was having a hard time understanding radian measure,
they kept converting even the obvious angles back to degrees. The floor in
my classroom is made up of 4 foot squares. I had the students push all of
the desks to the side of the room and each stand on their own "personal
origin." After drawing a large zero in the front of the room, we spent
measure.

Since then, I see a lot of "body language" during tests, but they are
understanding much better. :)

Mark Priniski Pioneering Partner '93
Rib Lake High School priniski@cedar.cic.net
Rib Lake, WI 54470