Lesson plan

Find a sum by making hundreds

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.7 http://corestandards.org/Math/Content/2/NBT/B/7
teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.9 http://corestandards.org/Math/Content/2/NBT/B/9
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Numbers can be decomposed and reorganized in any order to add and still be equivalent. Numbers can be decomposed into subunits and these subunits can be combined to form larger units. In this lesson, students apply their 3-digit place value knowledge to combine tens into hundreds. In previous grades, students learned about the value of each digit, and how numbers can be decomposed into the value of each digit (place value). Students now need to combine 10 tens to form hundreds and add hundreds to other hundreds, and tens to other tens to find the sum of two or more three-digit numbers. Students are asked to add three-digit numbers (pennies collected) and compare them to benchmark numbers (rewards for meeting goal amounts). Vocabulary: base ten, hundreds, tens, ones, three-digit, value, more than, less than Special Materials: Base ten blocks - hundreds, tens, and ones