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Transparency 3 Click the mouse button or press the Space Bar to display the answers.

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Presentation on theme: "Transparency 3 Click the mouse button or press the Space Bar to display the answers."— Presentation transcript:

1

2 Transparency 3 Click the mouse button or press the Space Bar to display the answers.

3 Splash Screen

4 Lesson 3 Contents Objective Find the prime factorization of a composite number

5 Lesson 3 Contents Vocabulary Factor Two or more numbers that are multiplied 3  4 both 3 and 4 are factors

6 Lesson 3 Contents Vocabulary Prime number A whole number that has exactly 2 unique factors, 1 and the number itself 2Factors 1 & 2 3Factors 1 & 3 5Factors 1 & 5 13Factors 1 & 13 Most Common Prime Numbers: 2, 3, 5, 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 47

7 Lesson 3 Contents Vocabulary Composite number A number greater than 1 with more than 2 factors 4Factors 1, 2, & 4 12Factors 1, 2, 3, 4, 6, & 12

8 Lesson 3 Contents Vocabulary Prime factorization Expressing a composite number as a product of prime 12 = 2 2  3 54 = 2  3 3

9 Lesson 3 Contents Example 1Identify Prime and Composite Numbers Example 2Identify Prime and Composite Numbers Example 3Find Prime Factorization

10 Example 3-1a Tell whether 13 is prime, composite, or neither. Answer: prime The factors of 13:1 and 13 1/3 Has 2 factors which are 1 and the number itself Fits the definition of “prime” number

11 Example 3-1b Tell whether 35 is prime, composite, or neither. 1/3 Answer: composite

12 Example 3-2a Tell whether the number 20 is prime, composite, or neither. Answer: composite The factors of 20:1 and 20, 2 and 10, 4 and 5 2/3 Fits the definition of “composite” number 20 has more than 2 factors

13 Example 3-2b Tell whether the number 41 is prime, composite, or neither. 2/3 Answer: prime

14 Example 3-3a Find the prime factorization of 96. 3/3 96 Write the number Draw prime factorization brackets Decide on prime number that will go evenly into 96 Think about divisibility rules Note: If even consider 2 If ones digits is 0 or 5 consider 5

15 Example 3-3a Find the prime factorization of 96. 3/3 96 The one’s digit is 6 which is divisible by 2 Place the prime number 2 to the left of the bracket Divide 96 by 2 and place the answer below the bracket 2 48 Determine if 48 is a prime number

16 Example 3-3a Find the prime factorization of 96. 3/ is not prime so place another prime factorization bracket under Since 48 is divisible by 2, place the 2 to the left of the bracket Divide 48 by 2 and place the answer below the bracket Determine if 24 is a prime number 2 The one’s digit is 8 which is divisible by 2 24

17 Example 3-3a Find the prime factorization of 96. 3/3 96 The one’s digit is 4 so 24 is divisible by is not prime so place another prime factorization bracket under 24 Since 24 is divisible by 2, place the 2 to the left of the bracket 2 Divide 24 by 2 and place the answer below the bracket 12 Determine if 12 is a prime number

18 Example 3-3a Find the prime factorization of 96. 3/3 96 The one’s digit is 2 so 12 is divisible by is not prime so place another prime factorization bracket under 12 Since 12 is divisible by 2, place the 2 to the left of the bracket 2 Divide 12 by 2 and place the answer below the bracket 12 Determine if 6 is a prime number 2 6

19 Example 3-3a Find the prime factorization of 96. 3/3 96 The one’s digit is 6 so 6 is divisible by is not prime so place another prime factorization bracket under 6 Since 6 is divisible by 2, place the 2 to the left of the bracket 2 Divide 6 by 2 and place the answer below the bracket 12 Determine if 3 is a prime number

20 Example 3-3a Find the prime factorization of 96. 3/3 96 The factors of 3 are 1 and fits the definition of a prime number Finished prime factoring so now write answer

21 Example 3-3a Find the prime factorization of 96. 3/3 96 Write the smallest prime number which in this case is Circle all the 2’s that were used in prime factoring, counting as you go Since there were 5 two’s, place an exponent of 5 with the 2 in your answer 2 5

22 Example 3-3a Find the prime factorization of 96. 3/3 96 Next put a multiplication sign Note: Do not use “x” for multiplication  Circle all the 3’s that were used in prime factoring, counting as you go Write the next smallest prime number which in this case is 3 3

23 Example 3-3a Find the prime factorization of 96. 3/3 96 Since there is only 1 three, do not put an exponent  You are finished after you circle your answer! Yippee 3 Answer: Note: Any prime number can be used. If you start with an odd number, you will not start with 2

24 Example 3-3b Find the prime factorization of 72. * 3/3 Answer: 2 3  3 2

25 End of Lesson 3 Lesson 1:3Prime Factors Even Assignment


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