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Mastering Prime Numbers through Mental Math Practice

Learn about prime and composite numbers, prime factorization, and tests of divisibility in this mental math lesson. Practice factorizing numbers using factor trees and division methods to enhance your math skills effectively on page 54.

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Mastering Prime Numbers through Mental Math Practice

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  1. Wednesday Nov. 3,2011 • You will need: • Book • Whiteboard • Notebook and Folder • Multiplication chart • Start working on the Mental Math • Pg. 54 • # a-h

  2. Lesson 9 Prime Numbers

  3. Prime Numbers • Counting numbers greater than 1 that have exactly two counting number factors: the number itself and 1.

  4. Composite Numbers • Counting numbers with more than two factors.

  5. Prime Factorization • Writing the number as a product of prime numbers. • Use a factor tree or division to prime factorize a number. • 36 • 45

  6. Tests of Divisibility • One way to test if a number is prime or composite is to determine if it is divisible (can be divided) by a counting number other than 1 or itself.

  7. Practice • Determine whether the numbers are prime or composite. • 526 • 305 • 123 • 1,237,526

  8. Practice • Use a factor tree to factorize these numbers: • 36 • 45 • 20 • 200

  9. Practice • Use division to factorize these numbers: • 16 • 40 • 50

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