In Grade 5, vertical number lines again provide support for students to make use of patterns in the base ten system, allowing knowledge of whole-number rounding (4.NBT.3) to be easily applied to rounding decimal values (5.NBT.4).
The vertical number line is used initially to find more than or less than halfway between multiples of decimal units. In these lessons, students are encouraged to reason more abstractly as they use place value understanding to approximate by using nearest multiples. Naming those nearest multiples is an application of flexibly naming decimals using like place value units.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 1, Topic C Overview.
Available from engageny.org/resource/grade-5-mathematics-module-1-topic-c-overview; accessed 2015-05-29.
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