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4-2 6 th grade math

alika avatar
alika
12 diapositives · 321 Views · Jul 17, 2014

4-2 6 th grade math. Prime Factorization. Objective. To use divisibility rules to check for divisibility and write the prime factorization of numbers in exponential form. Why? To help you with prime factoring, simplifying fractions, division. California State Standards .

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4-2 6 th grade math
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  1. 4-26th grade math Prime Factorization

  2. Objective • To use divisibility rules to check for divisibility and write the prime factorization of numbers in exponential form. • Why? To help you with prime factoring, simplifying fractions, division.

  3. California State Standards NS 1.4 (Gr. 5): Determine the prime factors of all numbers through 50 and write the numbers as the product of their prime factors by using exponents to show the multiples (e.g., 24 = 2 x 2 x 2 x 3 = 2³ x 3) MR 3.3: Develop generalizations of the results obtained and the strategies used and apply them in new problem situations.

  4. Vocabulary • Divisible • A number is divisible by another number if the remainder is zero after dividing. • 36 ÷ 6 = 6 • Prime Number • A whole number greater than one with only two factors- itself and one. • 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 57, 59, … • Composite Number • A whole number greater than one that has more than two factors • 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, … • Prime Factorization • Writing a number as the product of its prime factors • 24 = 2 x 2 x 2 x 3

  5. Divisibility Rules!

  6. How To Prime Factor - #1 • Make a ‘Factor Tree’ 40 2 x 20 5 x 4 2 x 2 = 2³ x 5 Factor out each number until you get only primes Circle the prime numbers to be organized Put final answer in exponential form

  7. How to Prime Factor- #2 Make a ‘Factor Ladder’ Put the number at the top of a ‘ladder’= box If it is even, begin ÷ 2 If not, try greater primes like 3, 5, 7, 9 Only move on when the current number you are using doesn’t work anymore Use the divisibility rules to help The numbers on the side of the ladder are the numbers used for prime factorization. prime factor 40 = 2³ x 5

  8. Try It! Tell if each number is divisible by: 2, 3, 4, 5, 6, 9,or 10 • 3,742 • 5,310 • 47,388 • 9,999 • 41, 112 • 2 • 2, 3, 5, 6, 9, 10 • 2, 3, 4, 6 • 3, 9 5) 2, 3, 4, 6, 9

  9. Try Some More! 3) 76 = 2² x 19 Use exponents to write the prime factorization of each number. • 64 • 48 • 76 1) • = 2⁶ 2) 48 = 2⁴ x 3

  10. More to Try Prime factor using exponents. • 81 • 90 9) 81 = 3⁴ 10) 90 = 2 x 3² x 5

  11. Objective Review • To use divisibility rules to check for divisibility and write the prime factorization of numbers in exponential form. • Why? You can now prime factor efficiently, simplify fractions, and divide better

  12. Independent Practice • Complete problems 12-23 • Copy original problem first. • Show all work! • If time, complete Mixed Review: 24-29 • If still more time, work on Accelerated Math.