Lesson plan

Add within 1000 using expanded form

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.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Numbers can be decomposed into subunits. Hundreds can be added to hundreds, tens to tens, and ones to ones. In this lesson, students are comparing two different representations of three-digit numbers used to add. Both representations are related to place value with the value of each digit represented seperately. One representation uses base-ten blocks, or drawings of base-ten blocks. The other representation uses numbers to show the value of each digit. Students will compare the two representations to see which is quicker and more efficient. Students at different stages of control over their base-ten understandings may prefer one representation over the other - students will move from more concrete representations to more abstract as their understanding and comfort level grow. Vocabulary: digit, value, expanded form, base ten, decompose, hundreds, tens, ones Special Materials: Base ten blocks (hundreds, tens, ones)