# 6. Use a factor chart to determine if a number is prime or composite (FP)

teaches Common Core State Standards CCSS.Math.Content.4.OA.B.4 http://corestandards.org/Math/Content/4/OA/B/4
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Lesson objective: Use a factor chart to determine if a number is prime or composite.

This lesson helps to build procedural skill with determining if a number is prime or composite. A t-chart is used here because it supports students' work with factor pairs and allows students to list factor pairs in an organized way. This work develops students' understanding that a prime number is a whole number greater than one with only one factor pair and that a composite number is a whole number greater than one with more than one factor pair.

Students engage in Mathematical Practice 3 (construct viable arguments) as they create t-charts to justify their conclusions on prime and composite numbers.

Key vocabulary:

• composite
• factor pair
• prime
• t-chart

Special materials needed:

• 2 dice
• 2 sets of game board markers
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