Unit 2 - Number Theory

(8.1) Use a factor tree to find the prime factorization of 27,720. Choose all answers that apply.

• $2\cdot2\cdot2\cdot3\cdot3\cdot5\cdot7\cdot11$

• $2^3\cdot3^2\cdot5\cdot7\cdot11$

• $2\cdot3\cdot5\cdot7\cdot11$

• $8\cdot9\cdot5\cdot7\cdot11$

(8.1) All of the following numbers are prime except:

• 491

• 263

• 227

• 493

Tags

CCSS.4.OA.B.4

Which choice lists all the factors for the number 24?

• 2, 3, 4, 6, 8, 12, 24
• 2, 3, 4, 6, 8, 12, 24, 36
• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 2, 4, 5, 6, 8, 12 ,24

Tags

CCSS.4.OA.B.4

105 is NOT divisible by which number?

• 1
• 2
• 3
• 5

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

All of these are prime except

• 3
• 9
• 2
• 13

Tags

CCSS.4.OA.B.4

What are the prime factors of 30? 

• 3, 2, 5 
• 1, 2, 3, 5, 6, 15, 30
• 3, 30
• 10, 3

What is the prime factorization of 16? 

• 1 x 16
• 2 x 2 x 4
• 2 x 2 x 2 x 2
• 8 + 8

Tags

CCSS.4.OA.B.4

GCF of 99 and 54

• 9
• 3
• 6
• 8

Tags

CCSS.6.NS.B.4

What is the GCF of 72, 96, and 84?

• 2
• 7
• 12
• 4

Tags

CCSS.6.NS.B.4