Factors and Prime Factor

Which of these is a valid prime factorisation of 18?

• 2, 3, 3

• 2, 3²

• 2 x 3³

• 2 x 3²

Which of the following are correct prime factorisations of 132? (Tick all that apply).

• 4 x 3 x 11

• 2 x 2 x 3 x 11

• 2 x 6 x 11

• 2 x 3 x 3 x 11

• 2² x 3 x 11

Which of these is a prime number?

• 27

• 33

• 41

• 49

Tags

CCSS.4.OA.B.4

Tick all the factors of 25

• 1

• 5

• 50

• 25

Tags

CCSS.4.OA.B.4

What is the prime factorization of 24?

• 3 x 8

• 3 x 2 x 2 x 2

• 4 x 6

• 2 x 2 x 3

Match the prime factorization to each number.

• 26

• 
• 81

• 
• 111

• 
• 200

• 
• 1000

• 

All prime numbers have how many factors?

• 0

• 1

• 2

• It can vary

Tags

CCSS.4.OA.B.4

All prime numbers have how many prime factors?

• 0

• 1

• 2

• It can vary

Tags

CCSS.4.OA.B.4

WITHOUT doing any division, the PF of 2310 can only be which of the following? (Think divisibility rules).

• 3 x 3 x 5 x 7 x 11

• 2 x 2 x 5 x 7 x 11

• 2 x 3 x 5 x 7 x 11

• 2 x 3 x 7 x 7 x 11

What is the prime factorisation of 17?

• 2 x 8.5

• 3 x 6

• 17

• None of the above