# 5. Compose two-digit numbers using component tens and ones (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: Compose two-digit numbers using component tens and ones.

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

Students engage in Mathematical Practice 2 (students make sense of the relationship between the numerals and the quantities; students will notice the pattern in the numerals as the quantities those numbers represent change) as they build a series of two-digit numbers on their way to composing 100.

Key vocabulary:

• ones place
• tens place

Special materials needed:

• deck of cards
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