Prime Factorization Teacher Resources

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A factor tree? What's a factor tree? A tree of factors? A factor tree is a method use to do the prime factorization of an integer. It's not complicated. Watch the teacher as she explains the steps and shows how to write the answer as a multiplication of prime factors.
Ninth graders work with composite numbers to find their prime factorizations. In this Algebra I instructional activity, 9th graders use factor trees and division to find the prime factors of a number. Students explore the use of prime factors to determine the GCF and LCM. TI-nspire handheld required.
Young scholars work with prime numbers. In this prime factorization lesson, students review writing numbers in their prime factorization form and solve multiple problems.
For this prime factorization worksheet, 5th graders complete multiple choice problems where they find the prime factorization of numbers up to number 4632. Students complete 15 problems.
Fifth graders identify the prime factorization for 48 using different sets of factors. They find the prime factorization for 60.
Here's a quick review on how to use a prime factor tree to find the greatest common factor of two numbers. This is one of the simplest ways to find the greatest common factor. So watch this video to get a refresher on how to do prime factorization.
Older elementary students will appreciate how clearly Sal explains how to find the prime factorization of 75. He shows the complete process, taking note of numbers that are, and are not primes, and why.
In this primes and prime factors worksheet, 8th graders solve 21 different problems to include identifying each number as prime, composite, or neither prime nor composite and listing all the primes less than 200. Then they complete each of 4 factor trees shown and write the number as the product of prime numbers. Students also determine the GCF and LCM of various number.
In this prime factor learning exercise, students write numbers as a product of primes. Explanations and examples are provided prior to the exercise. This two-page learning exercise contains ten problems.
Students complete math problems. In this prime factorization and exponents lesson plan, students learn how to express factors using exponents, practice prime factorization and complete practice problems for both.
Fifth graders examine prime and composite numbers and prime factorization. They define prime and composite numbers, view a teacher demonstration, then demonstrate prime factorization using small squares of construction paper.
The publisher has tagged this resource as designed to meet CCSS.Math,Content.6.NS.4, but it really is only the first step in the process of determining least common multiples and greatest common factors. Six numbers are given for learners to factor using the factor tree method.
In this prime factorization learning exercise, students prime factorize ten given numbers. The numbers range from 6 to 25.
In this prime factorization learning exercise, students use skills to find the prime factorization of the given numbers. An answer sheet is included.
Students recognize the difference between a prime and a composite number.  In this prime and composite number lesson, students  use a factor tree model to show prime factorization. Students participate in a bingo activity. Students complete a homework worksheet.
In this prime factorization and divisibility rules activity, students find the prime factorization for numbers and explore the divisibility rules for 2, 3, 4, 5, 6, ,9, and 10 in fifty-one problems.  The solutions are not provided.
Factoring is an important math skill, and it's often quite confusing for youngsters. This presentation does a good job of showing the basic skills and vocabulary needed to begin to understand this important process. Prime numbers, composite numbers, and prime factorization are all covered, and there's an ample supply of practice problems for learners to try their hands at. Very good!
In this prime factorization worksheet, students prime factorize the nine given numbers on a line. Each number goes to the hundreds place.
For this factors and prime factorization worksheet, 6th graders use examples to find all the factors for six numbers, then write six more numbers as products of prime factorization.
Fifth graders review the concept of prime factorization. Then, they use the rules for divisibility and other notions to find the prime factorization of unfamiliar numbers. They solve problems in a whole class setting.

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