Prime factors

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

All prime numbers have how many factors?

• 0

• 1

• 2

• It can vary

Tags

CCSS.4.OA.B.4

Which of these is a valid prime factorisation of 18?

• 2, 3, 3

• 2, 3²

• 2 x 3³

• 2 x 3²

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

What is the prime factorisation of 125?

• 5 x 25

• 5 x 5 x 5

• Both the above

• None of the above

Write 36 as the product of it's prime factors...

• 2 x 2 x 3 x 3

• 2 x 2 x 2 x 3

• 2 x 3 × 3

• 2 × 2 x 3

Is 5 prime or composite? 

• Prime
• Composite

Tags

CCSS.4.OA.B.4

All of these are prime except

• 3
• 9
• 2
• 13

Tags

CCSS.4.OA.B.4