Name 
Description 
Factor Rainbows/Prime and Composite Story  The students will learn one strategy for finding the factors of whole numbers. After creating factor rainbows students will learn the difference between prime and composite numbers. To integrate writing students will create a story using their chosen number. 
Fantastic Factors  In this lesson, students will start out using manipulatives to create arrays which will be used to find factor pairs. Students will use a TChart to determine the factor pairs of numbers. Students will then use their TCharts to determine if a number is prime or composite. 
Hooray for arrays!  Students will identify prime and composite numbers through arrays. The lesson begins with a fun situational story. 
Finding a Few Friendly Factors  Students will find factors for a given number 1100. This activity should lead to prime and composite numbers. Students will have the option of using manipulatives: counters, base ten blocks, Van De Walle matrix, foldables and or Geoboards. 
Using Rectangles to Find Prime and Composite Numbers  In this lesson, students will be using rectangles to find prime and composite numbers. Students will draw different rectangles for the area of a given set of numbers. They will determine the factor pairs for each number in the given set and use them to discover the meaning of prime and composite numbers.

Factor That! Part 1  This is a foundational lesson in which the students will visually see the relationship between factors and multiples. As a result of this hands on lesson and guided discussion, they will learn to identify the factors of a given number.
This is lesson one of a 5 lesson unit. It can be used independently or as part of a week long unit. 
Creating Factor Pair "Trees"  In this lesson, students will practice identifying factor pairs of whole numbers. Students will then draw a triangle around their factor work so that it resembles a triangular tree. Students will then circle all of the prime numbers inside the tree. The circles might represent the balls or ornaments on a holiday tree if doing this lesson around the holidays. This lesson does not teach an understanding of factors or prime numbers
but is, rather, a practice of the students' knowledge of these concepts. 
Fun with Factors  This is an introductory lesson addressing factors for number 120. Factoring will lead students to discover differences and similarities between prime and composite numbers. Students will also discuss five claims about factors, prime, and composite numbers and create support from examples and nonexamples to determine whether these claims are valid or invalid. 
Searching for the Primes  Students will use a 100s chart to sort out the prime numbers under 100 using the Sieve of Eratosthenes method. 
Prime Factorization  From Fingerprints to Factorprints  This activity provides an introduction to composite numbers and prime numbers through factorization. 