What Can You Do With This? GeoGebra Percents!
Jan 25th, 2009 by Nick
We’re doing percents of in Pre-Algebra tomorrow. For a good high impact visual review I think this will be helpful to project up onto the board. I am good at making geogebra manipulatives, but I still stink at what you do with ‘em once they’re up on the board. Dan mentioned his trouble in using a clip of proportionality from the bone collector at the end of the unit as a homework , which kind of gets to my frustration at the frequency with which I’m coming up short with good visuals in class.
I compare the luck I’ve had with a few slick manipulatives:
1. A demo visual on how outliers effect the mean
2. Slope calculators
3. A visual confirmation of the SSS congruence theorem I use every so often in geometry
My biggest success so far with visuals came in a lesson on proportions last week. I projected both of these
onto the board, told some stories about our trip to Colombia, and the Valle de Corcora, spinning a little evolution/geology with the rising Andes mountains and these high altitude palm trees. I drew a couple comparative lines to measure corresponding distances on each photo and then removed the photo so kids could compare the simple xy- measurement lines and see how out of proportion the stretch was.
Kids communicated why the stretch photo made us look like tall aliens, and could relate it back to the lack of proportionality. This worked because it was directly tied into the activity (pdf) | .tex (source)
Anyway, if this percent illustration gets a few ahaaaa’s I’ll be satisfied.
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