Throughout Topic C, students make connections between what they know of whole number multiplication to its parallel role in multiplication with decimals by using place value to reason and make estimations about products (5.NBT.7). Knowledge of multiplicative patterns from Grade 4 experiences, as well as those provided in Grade 5 Module 1, provide support for converting decimal multiplication to whole number multiplication. Students reason about how products of such converted cases must be adjusted through division, giving rise to explanations about how the decimal must be placed.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 2, Topic C Overview.
Available from engageny.org/resource/grade-5-mathematics-module-2-topic-c-overview; accessed 2015-05-29.
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