Lesson plan

Subtract within 100 by subtracting parts

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.5 http://corestandards.org/Math/Content/2/NBT/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
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 and recombined different ways to add and subtract. There are many solutions to the same problem. This lesson builds on students' understanding of composing and decomposing numbers as strategies to add and subtract. The task allows for students to think about how numbers can be decomposed and subtracted multiple ways as a strategy for subtraction. Vocabulary: add, subtract, equation, decompose, equal, value