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lesson 10
1 hour

Compare Decimals Using Area Models And Number Line


Description

Objective:  Use area models and the number line to compare decimal numbers, and record comparisons using <, >, and =.

Students move on to more abstract representations in Lesson 10, using area models and the number line to justify their comparison of decimal numbers (4.NF.7). They record their observations with the <, >, and = symbols. In both Lessons 9 and 10, the intensive work at the concrete and pictorial levels eradicates the common misconception that occurs, for example, in the comparison of 7 tenths and 27 hundredths, where students believe that 0.7 is less than 0.27 simply because it resembles the comparison of 7 ones and 27 ones. This reinforces the idea that, in any comparison, one must consider the size of the units.

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From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 6, Topic C, Lesson 10. Available from engageny.org/resource/grade-4-mathematics-module-6-topic-c-lesson-10; accessed 2015-05-29.
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