Lesson plan

# 4. Composing two-digit numbers (FP)

teaches Common Core State Standards CCSS.Math.Content.1.NBT.B.2 http://corestandards.org/Math/Content/1/NBT/B/2
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Identify the tens and ones that make two-digit numbers.

This lesson helps to build procedural skill with composing and decomposing two-digit numbers with/into their component tens and ones. Base ten blocks are used here because it supports understanding the components of two-digit numbers. This work develops students' understanding that two-digit numbers are made up of tens and ones.

Students engage in Mathematical Practice 7 (students continue to explore the structure of place value; they will see the system for grouping numbers into the tens and ones that compose the numbers) as they compose and decompose two-digit numbers with/into their component tens and ones.

Key vocabulary:

• ones place
• place value
• tens place

Special materials needed:

• base ten blocks
• hundred chart