WARM-UP How many packages of hotdogs and buns should George Banks have bought in order to not waste anything? Hotdogs…package of 8 Buns…package of 12.

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Presentation transcript:

WARM-UP How many packages of hotdogs and buns should George Banks have bought in order to not waste anything? Hotdogs…package of 8 Buns…package of 12 Video

Least Common Multiple (LCM)

*LCM’s play a big role in mathematics, especially when fractions are involved. When adding/subtracting fractions, it is necessary to find a common denominator. We use the LCM as the smallest common denominator.

Example: The multiples of 4 are The multiples of a number are the products of that number and the Natural numbers (1, 2, 3, 4, . . . ). A number that is a multiple of two or more numbers is a common multiple of those numbers. Example: The multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, . . . The multiples of 6 are 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, . . . *The Least Common Multiple (LCM) is the smallest common multiple of two or more numbers. The LCM of 4 and 6 is 12 Notation: LCM(4, 6) = 12

We need a more systematic approach to finding LCMs!!! We can find the LCM of two or more numbers by listing out the multiples of each and identifying the smallest common multiple. But, this could be difficult . . . Ex: Find LCM(24, 50) Do you know your multiples of 24 and 50? We need a more systematic approach to finding LCMs!!!

We will find the LCM using the prime factorization of each number.

Ex: Find the prime factorization of 24 and write it exponentially. Primes Quotient (composites) 24 24 = 2 * 12 2 12 24 = 2 * 2 * 6 2 6 24 = 2 * 2 * 2 * 3 2 3 Prime on the right  done  clean it up! 24 = 23 * 3

Ex: Find the prime factorization of 50 and write it exponentially. Primes Quotient (composites) 50 50 = 2 * 25 2 25 50 = 2 * 5 * 5 5 5 Prime on the right  done  just clean it up! 50 = 2 * 52

Ex: Find the LCM(24, 50) Find the prime factorization of each number: 24 = 23 * 3 and 50 = 2 * 52 Arrange the factorizations in a table primes 3 5 2 # 24 23 31 50 21 52 LCM 8 3 25 Circle the Largest product in each column The LCM(24, 50) is the product of the circled numbers: 8 * 3 * 25 = 600

Ex. Find the LCM(108,75)