Unit 1 CSA review

Which number is PRIME?

• 68

• 50

• 9

• 29

Which number is COMPOSITE?

• 11

• 51

• 31

• 43

What is the prime factorization of 75 in expanded form?

• 3 x 5 x 5

• 2 x 3 x 5

• 7 x 7 x 11

• 11 x 11 x 17

How would you write the following factor string using exponents?

2 x 3 x 3 x 5 x 5 x 5 x 11

• 2 x 3 x 5 x 11

• 2¹ x 3² x 5³ x 11⁴

• 2 x 3² x 5³ x 11

• 24, 750

What are all of the common factors of 80 and 48?

• 1, 2, 5, 10

• 1, 2, 4, 8

• 4

• 1, 2, 3, 4, 6, 8

Answer explanation

Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

So all of the common factors are: 1, 2, 4, 8

What is the prime factorization for 100 in EXPANDED form?

• 1 x 2² x 3³

• 2² x 5² x 7

• 2 x 3 x 5 x 10

• 2 x 2 x 5 x 5

What is the prime factorization for 100 in EXPONENTIAL FORM?

• 2² x 5²

• 2 x 2 x 5

• 2⁵ x 5²

• 50 x 2

2² x 7² is the prime factorization for which number?

• 3,000

• 196

• 125

• 49

What is the greatest common factor of 88 and 50?

• 25

• 14

• 1

• 2

What is the greatest common factor of 30, 12, and 10?

• 30

• 60

• 2

• 6