Lesson plan

Compare rounding with benchmarks of 10 and 100 by using place value

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.Content.3.NBT.A.2 http://corestandards.org/Math/Content/3/NBT/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
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 rounding to the nearest 10 and 100. Students are presented with a jar of marbles to compare values of different color marbles. Students round 3-digit numbers to the nearest 10 or 100 to determine closeness of approximations based on benchmark values. Vocabulary: base-ten, benchmark, compare, digits, expanded form, place value, rounding a whole number