Greatest Common Factors

What are factors?

• The top number in a fraction.
• The numbers multiplied together to make a product.
• The bottom number in a fraction.
• Angles smaller than 90 degrees.

Tags

CCSS.4.OA.B.4

How is a prime number different from a composite number?

• Prime numbers are smaller than composite numbers.
• Composite numbers are larger than prime numbers.
• All odd numbers are prime numbers.
• Prime numbers have only 2 factors, and composite numbers have more than 2 factors.

Tags

CCSS.4.OA.B.4

Are there any numbers that are neither prime nor composite?

• Yes
• No

Tags

CCSS.4.OA.B.4

Which one is prime?

• 100
• 455
• 71
• 182

Tags

CCSS.4.OA.B.4

Which one is a composite number?

• 37
• 41
• 21
• 29

Tags

CCSS.4.OA.B.4

GCF 15 and 36

• 8

• 6

• 3

• 4

GCF of 32 and 40

• 2
• 4
• 6
• 8

GCF of 50 and 100

• 10
• 25
• 50
• 5

GCF of 18 and 24

• 2
• 3
• 4
• 6

What is the GCF of 18 and 24?

• 3
• 6
• 8
• 9