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lesson 1
1 hour

Metric Measurement: Decomposition Into Tenths


Description

In Lesson 1, students use metric measurement and see tenths in relation to one whole in the context of 1 kilogram, 1 meter, and 1 centimeter. Using bags of rice, each weighing 1/10 kilogram, students see that the weight of 10 bags is equal to 1 kilogram. Through further exploration and observation of a digital scale, students learn that 1/10 kilogram can also be expressed as 0.1 kilogram, that 2/10 kilogram can be expressed as 0.2 kilogram, and that all expressions of tenths in fraction form (up to one whole) can be expressed in decimal form as well. Students then use their knowledge of pairs to 10 to determine how many more tenths are needed to bring a given number of tenths up to one whole. To bring together this metric measurement experience through a more abstract representation, tenths are represented on the number line and with tape diagrams as pictured below.

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From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 6, Topic A, Lesson 1. Available from engageny.org/resource/grade-4-mathematics-module-6-topic-lesson-1; accessed 2015-05-29.
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