Sujet: cross multiply liste de sujets
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	Comparing two fractions		2007-01-18
		Kayla pose la question : Why does eight over twelve compared to one half work when you use cross multiplication. Penny Nom lui répond.
	Cross multiplication		2000-02-16
		J E Swinton pose la question : Why does cross multiplication work? How come canceling work? Penny Nom lui répond.

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