Lesson plan

Add with 100s by decomposing

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.8 http://corestandards.org/Math/Content/2/NBT/B/8
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: It's easier to visualize adding 10s and 100s when you decompose numbers. When adding by 100 or 10 mentally, the 100s or 10s place value increases. Students need to learn how to manipulate numbers mentally by building conceptual knowledge of the number system. Students become more agile at adding by illustrating base ten concepts in various ways.