Divisibility chart – check your answers!

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Prime Factorization Notes 9/25/09

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Presentation transcript:

Divisibility chart – check your answers! Is it divisible… By 2? By 3? By 5? By 6? By 9? By 10? Ex: 63 X 1,512 x x 54 59,958 69,617 120 2,646 907 79,659 7,285 366 87 7,221 73,688 52,542 7,961

Daily 5 2 5 ----- ÷ ----- 3 7 Give a four digit number divisible by 2, 3, and 5. Identify the pattern and give the next three numbers: 4, 8, 5, 9, 6, ______, _______, _______. What is the divisibility rule for 6 ? Give an example.

A dog kennel groups the dogs in rows in order to determine at what time they will be given a treat. Each group should have the same number of dogs. There are 120 dogs in the kennel. How many groups are possible?

How many groups of dogs are possible? Given: (What do we know?) 1 row of 120 2 rows of 60 4 rows of 30 8 rows of 15 24 rows of 5 How many groups? How did you solve this problem? What did you use to solve this problem?

Prime factorization 120 Brain Pop - Factoring 2 rows of 60 2 60 2x2 or 4 rows of 30 2 30 2x2x2 or 8 rows of 15 2 15 2x2x2x3 or 24 rows of 5 3 5 Brain Pop - Factoring

Add this to your small notebook! PRIME FACTORIZATION: Expressing a whole number as a product of prime numbers. 24 2 12 3 4 2 2 2 x 2 x 2 x 3 = 24 23 x 3 = 24

Practice problems Use a factor tree to write the prime factorization of 250. Write all the factors of the number 16. Which of the following numbers is prime? 43, 21, 10, 30 A class of 20 students is on a field trip Ocean Adventure Park. The teacher wants to break the class into groups the same size. Final all the possible group sizes by writing all the factors of 20. 250 = 2 x 53 1, 2, 4, 8, 16 43 1 x 120 2 x 60 4 x 30 8 x 15 24 x 5

Prime factorization Prime Factorization (4 problems) due F: Wednesday, Aug. 29 B: Thursday, Aug. 30 Divisibility Quiz B: Thursday, Aug. 30.