id: 05805001
dt: j
an: 2010f.00710
au: Van Dyke, Frances; Keynes, Michael
ti: Keypad geometry and divisibility of numbers.
so: Aust. Math. Teach. 66, No. 2, 26-29 (2010).
py: 2010
pu: Australian Association of Mathematics Teachers (AAMT), Adelaide, SA
la: EN
cc: G40 F60 U70
ut: geometric concepts; geometry; calculators; mathematical logic; validity;
arithmetic
ci:
li: http://www.aamt.edu.au/Webshop/Entire-catalogue/Australian-Mathematics-Teacher
ab: Summary: In this article, the authors show how students can form familiar
geometric figures on the calculator keypad and generate numbers that
are all divisible by a common number. Students are intrigued by the
results and want to know "why it works". The activities can be
presented and students given an extended amount of time to think about
them. As students can easily generate their own examples, they can
continue to hypothesise why the property holds as the semester moves
on. The proofs of the more complicated figures should be given only to
those who are truly interested. (ERIC)
rv: