8/28/20: Unit 1: Block 5

Is 5 prime or composite? 

• Prime
• Composite

Tags

CCSS.4.OA.B.4

A prime number

• has one factor
• has more than 2 factors
• has 100 factors
• has exactly 2 factors: 1 and the number

Tags

CCSS.4.OA.B.4

Use a factor tree to find the prime factorization of 105

• 7x5x3

• 11x5x3

• 7x5x2x1

• 7x5x3x2

Write 36 as the product of it's prime factors... (There are two correct answers)

• 2 x 2 x 3 x 3

• 2 x 2 x 2 x 3

• 2² x 3²

• 2² x 3

Write 16 as the product of it's prime factors... (There are two correct answers)

• 2 x 2 x 2 x 2

• 2 x 2 x 2

• 2³

• 2⁴

What is the prime factorization of 252?

• $2^2\cdot3^2\cdot7^2$

• $2^2\cdot3^3\cdot7$

• $2^2\cdot3^2\cdot7$

• $2\cdot3\cdot7$

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

Find the prime factorization of 18

• 2 • 9

• 2² • 3

• 2 • 3²

• 3 • 6

Find the prime factorization of 60

• 5 • 12

• 2 • 3² • 5

• 2² • 3 • 5

• 2⁷

Find the prime factorization of 81

• 2² • 7

• 2³ • 5 • 7

• 4³

• 3⁴