Lesson plan

Round 2-digit numbers to the nearest 10 by reasoning about benchmark numbers

teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.1 http://corestandards.org/Math/Content/3/NBT/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Estimating is using approximate useful numbers. Rounding is an estimation strategy that uses place value benchmarks. 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 endangered animals for students to choose a number for rounding to the nearest 10 using an open number line. Students will discover rounding principles using their own benchmarks and mid-points to determine the principles for rounding. This builds conceptual understanding of rounding to build upon for practical use in problem solving using addition, subtraction, multiplication and division. Vocabulary: base-ten, benchmark, midpoint, compare, digits, place value, rounding, estimate Special Materials: Leopard Weight Handout (Supplementary Materials) Scissors Blank open number lines (optional)