Lesson plan

# 5. Adding tens and ones separately (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.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Add a two-digit number and a multiple of ten by adding tens with tens and ones with ones.

This lesson helps to build procedural skill with decomposing numbers into tens and ones to add. Cubes and numbers are used here because they support varying student needs for concrete and abstract representation. This work develops students' understanding that numbers can be decomposed and manipulated to conduct various operations.

Students engage in Mathematical Practice 5: Use Appropriate Tools Strategically as they choose their preferred tool to represent tens and ones while decomposing and composing numbers.

Key vocabulary:

• decompose
• ones
• ones' place
• place value
• tens
• tens' place

Special materials needed:

• cubes (towers of 10 cubes and loose cubes)