"Twenty percent free!": So how much does the original bar weigh?
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Abstract
Ngarewa Hawera and Merilyn Taylor describe a rich task based on a real world situation that stimulated a great deal of mathematical reasoning. Their research on how students attempted the task is most revealing.
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Hāwera, N. & Merilyn, T. (2011). "Twenty percent free!": So how much does the original bar weigh? Australian Primary Mathematics Classroom, 16(4), 3-7.
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Australian Association of Mathematics Teachers