Lesson plan

Subtract by decomposing hundreds to make tens

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.6 http://corestandards.org/Math/Content/2/NBT/B/6
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.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 into smaller units. These units can be reorganized to aid subtraction. Students will subtract multiple times, decomposing hundreds to make tens. Students will apply what they have learned about subtracting two-digit numbers to subtracting three-digit numbers. Students will also utilize their knowledge of the base-ten system developed in previous units to understand that one hundred can be decomposed into ten tens. Special Materials: Base ten blocks (hundreds, tens and ones) are recommended.