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Lesson plan

# Round to the nearest 100 by using benchmark numbers

teaches Common Core State Standards MP8 http://corestandards.org/Math/Practice/MP8
teaches Common Core State Standards MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards 3.NBT.A.1 http://corestandards.org/Math/Content/3/NBT/A/1

# Round to the nearest 100 by using benchmark numbers

Big Ideas: Rounding is an estimation strategy that uses place value benchmarks. Numbers rounded to a greater place value benchmark are easier to work with. This lesson builds on students' knowledge of place value of whole numbers less than or equal to 1000. This task uses the range of weights for the leatherback sea turtle for students to show numbers rounded to the nearest 100 using an open number line. Students will locate benchmarks and midpoints to apply the rounding principle. This builds conceptual understanding of rounding to build upon for practical use for problem solving using addition, subtraction, multiplication and division. Vocabulary: base-ten, benchmark, midpoint, expanded form, place value, rounding Special Materials: blank number line (optional) blank place value chart (optional)