Lesson 19: Factors and Prime Numbers

Pick the Correct Prime Numbers?

• 2,3,4,7,8,10,12,13,14,18,21,28,30,36,39,45,47
• 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47
• 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18
• 2,4,6,8,10,12,14,16,18,20,24,26,28,30

Numbers That are multiplied together are What?

• Fractions
• Multipliers 
• Dividend 
• Factors

What are Factor of 12?

• 6x6
• 3x3
• 3x4
• 3x9

How many factors do prime numbers have?

• 70
• 2
• 94
• 500

What is the GCF?

•  The GCF is the highest factor that two or more numbers have in common.
•  When a composite number is written as a product of all of its prime factors, we have the prime factorization of the number. 

The Factors of 18 are...

• 12345678910
• 1,2,3,6,9,18
• 1,2,3,4,6,8,12,24

The Factors of 24 are...

• 1,2,3,5,6,16,18,24
• 1,2,3,4,6,8,12,24

Which is not a factor of 24?

• 2

• 3

• 4

• 5

Tags

CCSS.4.OA.B.4

The number 7 is prime.

• True

• False

Tags

CCSS.4.OA.B.4

The factors of 16 are 1, 2, 4, 8, 16

While the factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24

What are the Common Factors?

• 1,2,3,4,5

• 1,2,4,6,8

• 12,3,4,6,8,12,16,24

Tags

CCSS.4.OA.B.4