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Factor Strings and Prime Factorization Everyday Math Lesson 1.9

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Lesson Objectives I can tell the difference between powers of ten written as ten raised to an exponent. I can show powers of 10 using whole number exponents

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Mental Math 2 x 2 =5 x 6 =6 * 9 = 2 x 3 =7 * 3 =8 * 9 = 3 x 4 =7 * 6 =9 * 7 = 4 x 5 =8 x 5 =8 * 6 =

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Let’s Check Your Homework! With a partner at your table, compare your answers to your study link 1.8. Resolve any differences you may have. Be ready to share your answers.

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Math Message 8 + 8 and 4 * 4 are two names for the number 16. In your Math Work Journal write at least 5 more names for the number 16.

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Vocabulary Add this vocabulary word to your Vocabulary Chart: –prime factorization

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Introducing Factor Strings A factor string is a multiplication expression that has at least two factors that are greater than one. –Example: a factor string for the number 24 would be 2 x 3 x 4

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Your Turn Write another factor string for the number 24; don’t use the same numbers as the example we did together.

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Let’s Try Again! Make a factor string for the number 7. What type of number is 7? You may not use 1 in factor strings, and 7 has no other factors except 7 and itself; therefore it is a prime number.

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Try this! Find factor strings for the following numbers: 30, 50, 54, and 72.

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Factor Rainbows The longest possible factor string for a number is also known as the prime factorization. In order to find prime factorization we can also use a factor tree.

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On Your Own! Try finding the prime factorization of the following numbers using factor trees: 36, 18, and 9.

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Finding Factor Strings and Prime Factorization With your assigned partner, complete Student Journal Pages 25 and 26. You will have 20 minutes to complete this assignment, when you hear the bell, return to your seat and be ready to share your answers.

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Let’s Play “Name That Number”! Turn to page 325 in your SRB and read about how to play “Name That Number”. With your assigned partner, you will have 15 minutes to play.

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