Copy of Fraction Multiplication

[b](Modified for HTML5 on 21 Nov 2013) [/b]Visualize the fraction multiples of a number and demonstrate a/b × c/d = (ac)/(bd). 中文版：http://www.geogebratube.org/material/show/id/15555 Anthony C.M. Or. GeoGebra Institute of Hong Kong.
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