# 3. Composing a ten with equations (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: Decompose the single-digit number to make a new group ten when adding.

This lesson helps to build procedural fluency with using equations to compose a new ten. Ten frames are used here to help with the transition to equations because they highlight how many more ones are needed to make a ten.  Students can use this information to inform the equation they use to show making a new ten.   This work develops students' understanding that when adding two-digit numbers, sometimes it is necessary to compose a new ten.

Students engage in Mathematical Practice 6 (Attend to precision) as they decompose and compose numbers. Students are precise in using equations to represent their problem solving steps.

Key vocabulary:

• decompose
• equation
• model
• ones
• tens
• ten frame

Special materials needed:

• ten frames
• base ten blocks or unifix cubes
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