Lesson plan

# 2. Deciding when to compose a new ten (FP)

teaches Common Core State Standards CCSS.Math.Content.1.NBT.C.4 http://corestandards.org/Math/Content/1/NBT/C/4
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Lesson objective: Identify equations that require composing a new ten.

This lesson helps to build fluency with deciding when a new ten needs to be composed. Base ten blocks are used here because it supports students in seeing how ten individual cubes are equivalent to a ten rod. This work develops students' understanding that we can add tens with tens and ones with ones and sometimes it is necessary to compose a new ten.

Students engage in Mathematical Practice 6 (Attend to precision) as they trade ten ones for a group of ten.  Trading too few or too many ones will result in a wrong answer.

Key vocabulary:

• compose
• ones
• tens

Special materials needed:

• base ten blocks
• equation sorting cards
• yes/no sorting headline cards (see In-Class Practice)