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Chapter 12
Number Theory
Number Theory
http://standards.nctm.org/document/chapter3/numb.htm
NCTM standards on numbers and operations. For grade band recommendations, click on the grade band you are interested in.
http://www.ento.psu.edu/extension/factsheets/periodical_cicada.htm
Periodical cicadas
http://www.aboutscotland.com/harmony/harmony.html
Harmony, proportion, and the square root of 2
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