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Greatest Common Factor (GCF)

Greatest Common Factor (GCF). SWBAT find the GCF of two numbers under 100. Warm Up (15 minutes). Work on division practice sheet. Vocab (10 minutes). Factor: a number that divides evenly into another number Greatest Common Factor : the largest factor shared by two or more whole numbers

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Greatest Common Factor (GCF)

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  1. Greatest Common Factor (GCF) SWBAT find the GCF of two numbers under 100.

  2. Warm Up (15 minutes) • Work on division practice sheet

  3. Vocab (10 minutes) • Factor: a number that divides evenly into another number • Greatest Common Factor: the largest factor shared by two or more whole numbers • Square Numbers: the product of an integer and itself (ex: 9 3x3)

  4. Example • GCF of 16 and 24 •  start by listing the factors of each number • 16: 1, 2, 4, 8, 16 • 24: 1, 2, 3, 4, 6, 8, 12, 24 Tips for listing factors: -Think of factor pairs (1x16, 2x8, 4x4)

  5. Practice • 1. Find the GCF of 12 and 30 • 2. Find the GCF of 35 and 45 • 3. Find the GCF of 32 and 60 • 4. Find the GCF of 22 and 55 • 5. Find the GCF of 20 and 65 • 6. Find the GCF of 35 and 100 • 7. Find the GCF of 16 and 48 • 8. Find the GCF of 15 and 64

  6. GCF Word Problems • Look for the key word GREATEST! • Kiara baked 30 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for her friends at school. She wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If she wants each container to have the greatestnumber of cookies possible, how many plastic containers does she need?

  7. Exit Ticket • 1. What does GCF stand for? • 2. What is the GCF of 18 and 30? • 3. Find the GCF of 42 and 35.

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