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8 -1 A number that has exactly 2 factors, 1 and itself. *2 is the first prime number. A whole number that has more than two factors. A number is either PRIME or COMPOSITE. It cannot be both.




You are watching: 8 1 factors and greatest common factors

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8 -1 Let’s find all the prime numbers up to 150…. • PLEASE KEEP THIS HANDOUT! YOU WILL BE ABLE TO USE IT ON ALL TESTS/QUIZZES!!!! • YOU GET 1 COPY.


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8 -1 finding which prime numbers multiply together to make the original number. The method we will use is the: FACTOR TREE


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8 -1 Factor Tree of 48. Steps: 1. Find ANY 2 factors of the original number. (Factors: 2 numbers multiplied together) 2. Find 2 factors of each new number. 3. Continue until you are left with ONLY prime numbers. ANSWER: 24 ∙ 3


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8 -1 1. Find the prime factorization of 90 2. Find the prime factorization of -20


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8 -1 3. Find the prime factorization of 42 4. Find the prime factorization of -140


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8 -1 5. Find the prime factorization of 56. 6. Find the prime factorization of -36




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8 -1 of two or more integers is the greatest number that is a factor of all of the integers. a. k. a: the largest # that will divide into all of the numbers evenly.


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8 -1 What is the GCF of the following: 1. 16 and 24 -Factors of 16: -Factors of 24: 2. 42 and 56 -Factors of 42: -Factors of 56: