# 5. Use place value to compare numbers less than 1000 (C)

teaches Common Core State Standards CCSS.Math.Content.2.NBT.A.4 http://corestandards.org/Math/Content/2/NBT/A/4
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Lesson objective: Apply our understanding of place value to compare three-digit numbers.

Students bring prior knowledge of comparing two-digit numbers from 1.NBT.B.3. This prior knowledge is extended to three-digit numbers as students decompose three-digit numbers to look at the hundreds, tens, and ones places. A conceptual challenge students may encounter is comparing a two-digit number with a three-digit number.

The concept is developed through work with expanded notation and base ten blocks, which allow students to focus on the value of each digit in a number.

This work helps students deepen their understanding of equivalence because they are using expanded notation and understanding place value to compare numbers.

Students engage in Mathematical Practice 3, as they decompose and represent numbers to explain which student is correct.

Key vocabulary:

• compare
• equal/equivalent
• expanded notation
• greater
• hundreds
• less
• ones
• tens

Special materials needed:

• base ten blocks
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